You shouldn't want to be friends with murderers.
Phil is studying behavioral science with a focus on serial killers.
Phil wants to pick the mind of a serial killer.
Phil arranges to conduct monitored interviews with a convicted serial killer.
Phil starts a correspondence with a convicted serial killer and soon develops a friendship with him.
Phil is able to get the killer to open up and share important data with him.
As Phil gets closer to the killer he begins to adopt some of his beliefs.