Jack Doyle, who can communicate with animals. is surprised to discover his little sister's tortoise hiding in his backpack during a field trip to a farm, and when Tut disappears, he has to use his special skill to find the pet in time.

When a prankster's tricks cause Principal Bumble to consider cancelling the big school trip, it's up to Jack and his brainiac friend, Elizabeth, to track down the culprit by using Jack's ability to talk to the animals at school.