The Detective duo investigate a killing that is latest in a string of crimes in the red-light district. Off duty, Hutch is getting serious with his new girl-friend, the classy Gillian, but as the intreptid Detectives investigate the killing, Starsky by chance finds that Hutch's new love is a prostitute, who wants out but is being forced to continue by a cunning pimp and his mother. Starsky knows that his unwitting discovery could destroy his partnership with Hutch...