After the discovery of Sally Quine's tortured and mutilated body in small town 'Harmony', Detective Patrick Styvesant is assigned to the investigation. Alasdair MacCrae, Sally's boyfriend and the initial suspect, hides in a motel, tracked by private detective Gacy. Visiting Sally's university, Styvesant learns about a game popular with the students: making a list of six possible actions and letting a dice decide which one to take. Psychology teacher Glenn Taylor has introduced the dice game to the students and to other people - among which, mentally disturbed Egon Schwimmer who bursts into the squad room razor in hand and confesses to Sally's murder. Styvesant finds and interrogates Gacy who claims he lost track of Alasdair. Styvesant secretly follows him to the murder scene where Gacy just discovered a button that the police have missed.