There is a menagerie of demons in an old house where Nat has been trained to be a Demonkeeper. Seemingly inanimate objects in his house are really little demons that cause chaos if they are loose. Most of them are relatively harmless, like the ones that produce weird smells or make you stub your toe. But some can kill. Nat is their keeper, with three mischievous minions for company, charged with preventing these creatures of chaos from wreaking havoc out in the normal world. Only a gifted demonkeeper can see and hope to control the hidden chaos so Nat has a thankless and lonely job. Local boys accidentally release the Beast from the basement and the Thin Man is out there, hunting demons for his own evil purposes. No longer alone, Nat must team up with Sandy, the library assistant and Richie, a tough street kid to capture the deadly Beast before it's too late.