Batcat loves being all alone in their home on Spooky Island, spending time playing videogames and watching TV. But, when they find themself being haunted by an annoying, ice cream-stealing ghost, they visit the local Island Witch for a spell to remove their ghostly guest permanently.

Johnny Boo creates an incredible Ice Cream Computer that can turn anything into delicious ice cream. Old toys that you don't want to play with anymore? Ice cream! Clods of dirt and grass? Ice cream! It works great... until Squiggle decides to turn himself into ice cream! Then: Johnny Boo time travels to the future, where the Mean Little Boy tries to add him to his butterfly collection. Can Squiggle save the day, or will everyone get turned into ice...

"Johnny Boo lets Squiggle borrow his magic hammer so Squiggle can work on a mysterious project, but that leaves Johnny Boo with nothing to do today. He has lots of great ideas about how to spend his time while he waits, but ends up getting bored of each and every one of them. Not to worry, though. Joined by Squiggle, the Ice Cream Monster, and a big new friend, Johnny Boo will still have a hilarious adventure...and maybe even learn something about...

"Geronimo Stilton's dealt with mummies, ninjas, and pirates, but this may be the first time he's come face to face with... ghosts! Can the scaredy-mouse overcome his fears and get to the bottom of the mystery for a big scoop for his newspaper, The Rodent's Gazette? For help, who's he gonna call? His ghost-bustin' relatives, of course! Geronimo and his family need to travel to a haunted museum in Africa for this globe-trekking, teeth-chattering spooky...