Hold onto your whiskers, because things are getting very spooky underground! A terrifying ghost is haunting the dark subway tunnels of New Mouse City, and everyone is panicked. Geronimo Stilton is trembling with terror, but as a dedicated newspaper publisher, he knows he must get the scoop for The Rodent's Gazette. You will need to muster all your courage to join Geronimo as he bravely steps into the shadowy tunnels to investigate. As you tiptoe through the darkness, following the creepy clues, prepare yourself for the absolute fright of your life. The fearsome phantom terrorizing the tracks is actually a giant cat! Can Geronimo survive this horrifying encounter and write the best news story of his career? Jump aboard this fast-paced chapter book for a funny, thrilling mystery that is perfect for readers who love a good laugh and a great scare.