Twins Lewis and Allison are excited to join their new neighbors for an awesome vacation: they'll be driving to Yellowstone in a motor home, seeing all the fantastic sights, getting to know the Rupe family...the trip should be a blast. It turns out to be anything but.

First they discover that the Rupes have no interest in nutrition, manners, or their children. Even worse, a couple of strange men seem to be following them. Could they have something to do with the one-hundred-dollar bills little Billy Rupe keeps finding in the motor home? Lewis is afraid the answer is yes--and his fear is not unfounded...

This novel was originally published as The Absolutely True Story...How I Visited Yellowstone Park With the Terrible Rupes.