Thea Stilton

Are you ready for a thrilling adventure with the super-stylish Thea Sisters? Join Thea Stilton and her amazing friends at Mouseford Academy! Their marine biology class takes an unexpected turn when they learn about a legendary shipwreck and a very rare diamond called Jasmine's Heart, lost deep in the ocean. Things get really exciting when their professor, Van Kraken, suddenly disappears! Now, it's up to the Thea Sisters to become detectives and brave divers. They'll have to plunge into the mysterious ocean depths to find their teacher and uncover the secrets of the sunken ship and its precious jewel. But the adventure doesn't stop there! Just when they think their mission is complete, an invitation arrives to travel all the way to China for another missing treasure hunt. Get ready to explore the world with these five smart and brave mice as they solve puzzles, discover secrets, and stick together through every challenge. It's a journey you won't forget!

Pack your bags and get ready for a tropical getaway that quickly turns into a thrilling hunt for hidden pirate gold. When the Thea Sisters travel to the beautiful Bahamas for a relaxing vacation, they stumble upon a mysterious old map linked to a local legend. Naturally, these five resourceful friends cannot resist the call of a real treasure hunt. They set sail on the sparkling waters of the Caribbean Sea, following ancient clues and decoding secrets from the past. But they soon discover they are not the only ones chasing the legendary prize. Someone else is hot on their trail, and it will take all their teamwork and clever thinking to reach the treasure first. Grab your compass and join the adventure as the mouselets navigate sun-drenched islands and hidden dangers in this fast-paced mystery.

Pack your ballet shoes and travel to Italy, where a prestigious dance competition is hiding a sneaky secret. The Thea Sisters are thrilled to attend the famous ballet event, but they are not just there to watch the graceful performances. A talented new friend of theirs is competing, and the five friends quickly discover a shady plot to cheat and ruin the entire contest. Someone is trying to rig the competition to make sure their favorite dancer wins, putting their new friend's dreams in serious danger. The clever mouselets must leap into action and go undercover to gather clues behind the stage curtains. They will need perfect teamwork and quick thinking to expose the cheaters, save the ballet competition, and make sure the most deserving dancer takes home the prize.

Pack your bags for a wonderful trip to Japan, where beautiful cherry blossoms are blooming and a sneaky thief is on the loose. The Thea Sisters are visiting the amazing city of Kyoto as part of a special cultural exchange program. They are having a wonderful time exploring the sights and learning about Japanese traditions. But the fun is interrupted when a very rare and valuable doll is stolen from a wealthy collector. The five smart friends know they have to help. They begin a fast-paced hunt through the city, following hidden clues and asking questions to track down the missing treasure. With their special friendship and teamwork, they are ready to solve the case and make sure the precious doll is returned safely to its home.

Travel to the bustling cities and lush jungles of India for a high-stakes rescue mission. When the Thea Sisters hear that their good friend Ashvin is in trouble, they immediately fly out to help him. Ashvin has been working hard on a noble project to return city-dwelling monkeys back to their natural jungle homes. But things have gone terribly wrong because the monkeys have suddenly started stealing valuable jewels. When a priceless emerald belonging to an Indian Prince goes missing, Ashvin is blamed for the mess. The five friends know the monkeys are not acting alone and that a human thief must be teaching them to steal. They must dive deep into the lively city streets to follow the tricky trail, find the real mastermind, and return the royal emerald before it is gone forever.

Travel to the misty hills of Scotland for a hauntingly good rescue mission inside a towering ancient castle. When the Thea Sisters learn that their good friend Bridget has to rush home for a sudden family emergency, they immediately offer to help. But shortly after arriving in Scotland, the situation takes a scary turn when Bridget completely disappears. The five friends know they must find her before it is too late. Their search leads them deep into her family's giant, crumbling castle, where they uncover a trail of cryptic messages, old Celtic legends, and rumors of hidden treasure. They have to navigate dark hallways, solve ancient riddles, and figure out who would want to kidnap their friend. It is a true test of their bravery and friendship as they work to uncover the castle's biggest secret.

Prepare for a breathtaking climb high into the Andes mountains of Peru on a quest to find a forgotten world. The Thea Sisters are called into action when a good friend of Paulina finds himself in serious danger while exploring. To save him, the five friends must travel to South America and trek through rugged, dangerous terrain. Their journey points them straight toward the legendary Secret City of the Incas, a place rumored to hide a massive, ancient treasure. But the mountains are full of wild challenges, and they quickly realize that finding the city is only half the battle. They have to follow hidden clues left behind by ancient civilizations and outsmart rivals who want the treasure for themselves. It is an amazing test of courage and teamwork in one of the most mysterious places on earth.

Grab your digging tools and travel to the sandy dunes of Egypt for a massive archaeological adventure. The Thea Sisters are thrilled to be invited to help on a real excavation site, searching for the legendary Treasure of the Sun. Their biggest clue is a precious blue stone scarab that could finally unlock the secrets of the past. The five friends enthusiastically brush away the sand, learning all about ancient history and uncovering hidden passageways. However, they soon discover that a gang of greedy thieves is also hunting for the ancient gold. The clever team must race against the clock to decipher old hieroglyphics and navigate tricky traps left behind by ancient builders. They will need perfect teamwork to outsmart the thieves and protect the priceless artifacts from falling into the wrong hands.

Travel to the beautiful, flower-filled country of the Netherlands for an artistic adventure that quickly turns into a major missing persons case. While Violet is happily taking an art class to improve her painting skills, her friend's father mysteriously disappears without warning. The missing man is a renowned botanist, and his sudden disappearance seems directly linked to his top-secret research on the extremely rare black tulip. The Thea Sisters know they cannot waste a single minute. They set out on a desperate search that takes them past giant windmills, down quiet water canals, and through massive, colorful flower gardens. As they gather clues hidden among the blooms, they must figure out who would want to steal the famous flower and kidnap a scientist. It will take all their puzzle-solving skills to crack this floral mystery.

Grab your hiking boots and travel to the wild island of Madagascar for an intense wilderness survival competition. The Thea Sisters are extremely excited to attend Adventure Camp, where they can test their outdoor skills and explore a stunning nature preserve. They love studying the highly unique plants and learning about the incredible animals that live nowhere else on Earth. But the fun camping trip turns serious when they realize they are not alone in the dense jungle. A group of intruders is threatening the local endangered wildlife, putting the entire ecosystem at risk. The five friends know they must step in and help. Using all their new survival training and perfect teamwork, they have to navigate the wild terrain, track down the wrongdoers, and protect the innocent animals before it is too late.

Get ready to move your feet and travel to Spain for a vibrant festival filled with beautiful music, fast dancing, and a sneaky crime. The Thea Sisters are visiting close friends and soaking in the rich culture, but the fun stops abruptly when a highly precious, historical fan is stolen right from the party. The theft instantly turns their relaxing holiday into a fast-paced investigation. As they hunt for the missing item, they discover that the fan is actually a clue leading to a much larger, secret treasure hidden somewhere in the city. The problem is, they are not the only ones looking for it. The five clever friends must follow the rhythmic sounds of flamenco dancing through the crowded streets, solve old riddles, and outsmart the thieves to recover the treasure first.

A woolly mystery is unraveling in the Australian outback, and the Thea Sisters are ready to chase every clue. When sheep on Nicky’s family ranch begin losing their wool, the ranch’s future is suddenly at risk. The answer may be hidden in an Aboriginal medicine made with a strange root, but finding it means traveling across Australia, meeting new challenges, and thinking like true detectives. Fast-paced, colorful, and full of friendship, this illustrated chapter book blends travel adventure with a lively mystery. Young readers can follow the five mouselings as they use curiosity, teamwork, and courage to help a family in trouble.

Paris is sparkling with fashion, but someone has turned the runway into a crime scene. The Thea Sisters travel to France to visit Colette’s fashion-designer friend, Julie, just as she is preparing for an important show. Then Julie’s designs disappear, and the city becomes a maze of clues. From stylish studios to famous Paris streets, the friends must search carefully, think quickly, and work together before the thief ruins everything. This lively illustrated chapter book gives young readers a mystery with travel, friendship, and just the right dash of glamour. It is a fun pick for readers who enjoy detective stories, city adventures, and clever teams of friends.

The Alaskan ice is cracking for the wrong reason, and the Thea Sisters are determined to find out why. During a trip to Alaska for an ecological conference, the five friends learn about local customs, games, and the fragile beauty of the northern landscape. But their adventure takes a dangerous turn when they discover that someone is using explosives to damage the ice and threaten the ecosystem. Blending mystery, action, and environmental stakes, this illustrated chapter book invites young readers into a chilly investigation where paying attention matters. With friendship at the heart of the story, the Thea Sisters must gather clues and act before more harm is done.

Step into the spotlight with Geronimo's bold and adventurous sister, Thea Stilton, in a super special mystery that will keep you guessing. When Thea accepts an invitation to teach a journalism class at a prestigious college on Mouse Island, she expects a quiet semester of writing and reporting. But when one of her very own students suddenly vanishes, the classroom turns into a real-life crime scene. You will team up with Thea and five brilliant students as they follow a trail of nail-biting clues, uncovering underground tunnels and dusty secret passages along the way. Can these clever young detectives crack the dragon's code and rescue their friend before time runs out? Packed with action, teamwork, and thrilling surprises, this adventure proves that solving a mystery is always better when you do it with great friends.

Bundle up for a chilling journey to the icy landscapes of Iceland, where a beloved mystery writer has vanished into thin air. The Thea Sisters are huge fans of this famous author, and they are not about to let his disappearance go unsolved. To track him down, the five friends must travel across the freezing but beautiful terrain, following a trail of strange clues that seem to match the plot of his upcoming novel. As they reconstruct his story step by step, they realize the situation is much more dangerous than a simple game of hide and seek. They are not the only ones looking for the missing writer. The brave friends must work together to crack the case and find the author before their frozen adventure melts into a complete disaster.

Follow the delicious scent of cocoa all the way to Ecuador for a mouthwatering mystery inside a massive candy factory. The Thea Sisters are visiting a good friend who runs an amazing chocolate-making business. His factory is famous for its eco-friendly methods and is even in the running to win a major environmental award. But the sweet success suddenly turns bitter when the factory's production machines start breaking down in strange ways. The friends quickly realize this is no accident—someone is actively trying to sabotage the business and ruin their friend's chances of winning the prize. The five clever detectives must go undercover on the factory floor, inspect the sticky machines, and track down the culprit. They have to work together to stop the sabotage and save the chocolate supply before the factory is shut down.

Put on your most colorful costume and travel to Venice, Italy, for an unforgettable festival filled with secrets and surprises. The Thea Sisters are incredibly excited to attend the famous Carnival, an annual celebration known for its elaborate dresses and beautiful, mysterious masks. They spend their days exploring the ancient city's narrow bridges, riding in gondolas down the water canals, and admiring the stunning outfits. But the joyful celebration is ruined when a sneaky thief begins striking right in the middle of the crowded parties. With everyone wearing disguises, finding the culprit seems impossible. The five sharp friends must work together, looking past the fancy masks to track down the clues. They have to catch the criminal and unmask them before the Carnival comes to a close and the thief escapes forever.

Lace up your ice skates and head to Russia for a thrilling mystery set at a massive figure skating championship. The Thea Sisters are excited to watch the amazing athletes perform, but the competition turns sour when their new friend is falsely accused of a terrible theft. Banned from competing for the gold medal, the young skater needs help, and the five friends are determined to prove her innocence. As they investigate the crime, they stumble upon a hidden collection of ancient love letters that might just hold the key to identifying the real thief. Time is running out before the final skating routine, and the friends must follow the clues across the chilly city. They have to work together to clear their friend's name and save her chance at winning the championship.

Travel to the tropical islands of Hawaii, where a beautiful cultural festival is hiding a massive, fiery secret. The Thea Sisters are thrilled to visit the islands and compete in a large international hula dance competition. They are having an amazing time practicing their routines, making new friends, and enjoying the beautiful beaches. But their relaxing trip is cut short when they make a terrifying discovery. The festival grounds are located right on the side of a massive volcano that is showing signs of an upcoming eruption. Shockingly, no one else seems to realize the extreme danger they are in. The five friends must leap into action, using their quick thinking and teamwork to warn the locals and safely evacuate the area before the fiery lava begins to flow.

Grab a front-row seat and step onto a real movie set in sunny California. The Thea Sisters are visiting a friend in Hollywood and are thrilled to get a behind-the-scenes look at how films are made. They love watching the famous directors and talented actors work their magic on camera. But the movie magic grinds to a halt when a highly important reel of film is suddenly stolen right off the studio lot. Without that film, the entire movie could be ruined. The five clever friends immediately take on the roles of lead detectives, searching the glamorous studio for clues and interviewing suspicious characters. They have to use all their unique skills to track down the missing film reel, catch the sneaky thief, and save the movie before production is shut down for good.

All aboard the most famous train in the world for a high-speed chase across Europe. The Thea Sisters are traveling from Paris to Istanbul on the legendary Orient Express. This is no ordinary trip, as the train is carrying a highly precious wedding dress that was stolen years ago and is finally being returned to a museum. The passenger list is filled with glamorous celebrities and important figures, but there is also a dark rumor spreading through the train cars. The mysterious Acrobat Thief is reportedly on board and planning to steal the dress right while the train is moving. The five friends are determined to outsmart this incredibly sneaky villain. They must patrol the train, solve tricky puzzles, and work as a perfect team to protect the dress and unmask the thief before they reach their destination.

Pack your binoculars and travel up north to Canada for a bird-watching adventure that takes a sudden, mysterious turn. The Thea Sisters are invited by friends to explore the great outdoors, learn about Canadian culture, and even discover a new love for the fast-paced game of hockey. Everything is going wonderfully until a member of their tour group simply vanishes into thin air. Knowing that time is of the essence, the five friends immediately shift into detective mode. Their search leads them straight to the roaring waters of the famous Niagara Falls. With the massive waterfalls crashing around them, they must follow a tricky trail of clues and piece together the timeline of the disappearance. They have to work together and brave the misty environment to find their missing friend and solve the puzzle.

A lion cub has vanished on the Kenyan savanna, and the Thea Sisters are right in the middle of the search. The friends arrive in Kenya for a photo safari, excited to explore the landscape and learn about the animals living on the reserve. Then a newborn lion cub is kidnapped, turning their trip into a race across the savanna. To help bring him back, the mouselets must follow clues, stay brave, and rely on one another. This fast-moving illustrated chapter book combines animal adventure, mystery, and friendship in a setting full of wildlife and danger. It is a strong choice for young readers who like detective-style stories with travel, teamwork, and high-energy action.

Step into the spotlight and travel to beautiful Greece, where a relaxing holiday transforms into a dramatic rescue mission. The Thea Sisters are enjoying their vacation when they meet a friendly theater company preparing to put on a major play. When one of the actresses gets hurt, Colette bravely steps in to take her place on stage. But the real drama happens entirely behind the scenes. Just before the curtain is supposed to rise, the lead actor vanishes without a trace. Now the five adventurous friends must search the ancient ruins and bustling streets of Greece to find their missing friend. With time running out before opening night, they have to piece together the clues and solve the case so the show can go on.

Blast off for an adventure that is truly out of this world as the Thea Sisters head to outer space. When a brilliant professor organizes an exclusive trip beyond the Earth's atmosphere, the five friends are absolutely thrilled to be invited. After intense preparation, they board a massive rocket and travel all the way to a high-tech vacation spot on the moon. But this relaxing lunar holiday quickly turns into a disaster when everything starts breaking down. They face terrifying spaceship wrecks, malfunctioning equipment, and a group of highly rebellious robots that refuse to follow orders. Trapped far from home, the clever friends must use their science skills and quick thinking to take back control of the base. They have to work together to fix the broken technology and find a safe way back to Earth.