The Pirate Cats decide to get rid of Professor Volt by kidnapping him and leaving him in the Cretaceous Period—a time when the Earth was occupied by dinosaurs. Geronimo and his friends must travel back in time to save Professor Volt from literally becoming part of history. Full color.

The Pirate Cats have had their plans foiled by Geronimo Stilton time and time again, due to the help from Geronimo's friend Professor Volt. The Pirate Cats decide to better their odds by getting rid of Professor Volt; kidnapping him and leaving him in the Cretaceous Period - a time when the earth was occupied by dinosaurs! Geronimo and his friends must travel back in time 140 million years to save Professor Volt from literally becoming a part of history.

GERONIMO STILTON runs a newspaper, but his true passion is writing tales of adventure. Here in New Mouse City, the capital of Mouse Island, his books are all bestsellers! His stories are full of fun—tastier than Swiss cheese and tangier than extra-sharp cheddar. They are whisker-licking-good stories, and that's a promise!