A young woman is raped and strangled on a Los Angeles beach. Further down the coastline a young boy is shot and arrested for her murder. Quincy doesn't think that it would have been possible for the boy arrested to strangle the woman and decides that he is going to go out and begin a little investigation of his own. He visits City Hall where the woman worked to ask some questions and, after a little checking, finds out that there seem to have been a rash of unexplained deaths there.

Quincy investigates a plane crash at sea and discovers that most of the victims died needlessly.

A family is violently murdered in their own home. The man arrested is the son and brother of the family members. He is a schizophrenic who blames everything on ‘The Beast', an alter ego inside his head who can take him over if he stops taking his medication. Quincy thinks, after talking with the DA, that he could be making it all up to get off on an insanity plea and tries to prove his theory.