If you don't believe in the existence of evil, you've got a lot to learn.
Neighborhood boy Todd Bowden (Renfro) discovers that an old man living on his block named Arthur Denker (Mackellan) is nazi war criminal. Bowden confronts Denker and offers him a deal: Bowden will not go to the authorities if Denker tells him stories of the concentration camps in WWII. Denker agrees and Bowden starts visiting him regularly. The more stories Bowden hears, the more it affects him.