Haven't you always wanted to sneak behind the scenes of your favorite amusement park? Imagine what lies beyond those fancy walls and landscaping, past those signs that say "Employees Only." How do the rides really work? What's making those strange noises?

Mimi has always wanted to know. She drags her nervous brother past the construction fence to discover the secrets of Dinosaur World's newest attraction. Surprises, excitement, and danger are waiting for them in Prehistoria.