Adrian Monk was once a rising star with the San Francisco Police Department, legendary for using unconventional means to solve the department's most baffling cases. But after the tragic (and still unsolved) murder of his wife Trudy, he developed an extreme case of obsessive-compulsive disorder. Now working as a private consultant, Monk continues to investigate cases in the most unconventional ways.

Haunted by recurring dreams of Hea-Thor, a gorgeous cavegirl,and a menacing Allosaurus, action-movie star Tony Markham soon finds himself transported, by means of a magic Icon, back through time to Dinosaur Valley. Now trapped in world of dangerous dinosaurs, grunting cavemen and a tribe of exotic, love-starved cavegirls, Tony must put his modern-days skills to extreme tests in order to survive prehistoric perils, win the cavegirl of his dreams and (maybe) return to his own time?