The story purports to explain "what really goes on under the bed" and why children are always getting blamed for things they did not do. Beginning as a flashback, it tells of how Maurice befriends Brian and shows him a world where there are no rules and no parents to tell them what to do. However, there is more to this fantasy world than meets the eye, and when Brian's brother Eric (Fred Savage's real life brother Ben Savage) is kidnapped, the fun and games turn deadly serious.