A small revolutionary feminist group publishes a leaflet urging revenge attacks against men for what its author perceives to be the glorification of Jack the Ripper. Soon afterwards, the bodies of two men are found mutilated on derelict waste ground. The police begin to investigate whether there is a connection between the members of the group and the murders, but find few leads. Private investigator Philip Rivers is called in to help by the parents of their son, who they believe could be the killer's next victim, as he shares a flat with a member of the group. Rivers decides the best way to protect him is to find the killer.