Around 1650 A.D., Nick Knight is staying with a Puritan friend, a farmer named Matthew. Secretly, Nick steals out to the barn each night in order to fly off and hunt. Unfortunately, Matthew repeatedly glimpses him coming and going, and finds it difficult to reconcile what is going on with his friendship with Nick. On the one hand, Nick could be a demon; but Nick scoffs at the suggestion, which Matthew is loathe to believe, since he likes Nick. The only alternatives, though, are that he himself must be insane or possessed.