The Secret of the Doolittle Device (#3 The Tails of Frederick and Ishbu)
Ishbu loves carrot sticks and marshmallow treats, and Frederick loves Geography. The rat brothers live and learn in a cozy cage in Miss Dove’s classroom, until the fateful day when Mrs. Thorn throws them out of the window, and launches them on a wild journey to save the world. This third adventure finds them traveling the globe in search of a rare element needed to power the mysterious Doolittle Device. But can the brothers reach it before the Big Cheese gets his evil paws on it?