Craig is an average guy who just happens to kill people when he's angry with them. The movie starts with him dealing with the death of his parents, who were killed in a fire. Later, in a scene in which his dead, mutilated father talks to him, it's reaffirmed that he did indeed killed his folks. Craig is humiliated by a woman swim teacher at the gym where he's a custodian and later kills her by drowning her in the same pool. A police detective who looks like Michael Berryman suspects that Craig may be the killer after his fingerprint is found on a hooker's dead body, but the police are slow in apprehending him.
Then, he meets an ideal woman over the internet and goes out with her for dinner. They immediately hit it off, though she does most of the talking, and they sleep together. The next day she calls and breaks up with him, saying "it just doesn't feel right". At this point he really snaps and cries like a baby. He kidnaps her, takes her out in the woods and lets her have a head start for the chase. It's like THE MOST DANGEROUS GAME. This doesn't really make much sense because she's in much better shape than flabby Craig, yet he manages to get ahead of her. The detective has also followed him out there for an eventual showdown.
CRAIG is a good character study of a serial killer and it's always interesting to see a flick where the main character has no redeeming qualities whatsoever.