A family vacation quickly goes awry in this fast-paced and funny mystery novel from Willo Davis Roberts. Winner of the Edgar Award! 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.