Growing a vegetable garden takes a lot of hard work, but best friends Jilli and Jim are ready for the challenge. They are determined to keep every bug and slug far away from their precious plants so they can march proudly in the big Vegetable Parade at the end of the summer. Everything is going perfectly until a massive, strange plant appears right in the middle of their garden. It looks like a huge green monster, and it is growing bigger every single day. Now, Jilli and Jim have a giant mystery to solve before the parade. Could this unusual plant be dangerous enough to eat their hard-earned vegetables? Is it going to gobble up Jilli's brave dog, Fiercely? You will love joining these two best friends on a hilarious and exciting outdoor adventure as they team up to figure out exactly what kind of monster is taking over their backyard.