On a trip to Pennsylvania, presidential stepdaughter KC Corcoran and her friend Marshall are exploring the rest of the train when the special caboose at the back disappears--along with the Vice President.

Dink, Josh, and Ruth Rose investigate the theft of a great deal of money from the belly of a nearly life-size Tyrannosaurus Rex model that their friend, Jud Wheat, is using to raise money for a dinosaur museum.