 Sgt. Enright is scheduled to receive a high honor from the San Francisco Police Department, but it turns into a nightmare when his ex-wife showed up. They had divorced because of her psychotic jealousy, and it s grown worse over the time apart. While they are arguing in a room backstage at the awards ceremony, a shot rings out. Enright pulls out his service revolver and looks around, pulling open the door to the adjacent hallway. More officers break in and grab Enright. The ex-wife is slumped on the floor with blood all over her blouse. An investigation of Enright s weapon reveals that a bullet was fired from it. The ex-wife is DOA at the hospital, with the man who accompanied her (a magician) having disappeared. An autopsy finds that the bullet that killed her was fired from Enright s gun. It seems like an airtight case against Enright, but Mac refuses to believe it and looks into the possibility that Enright was the victim of a clever frame-up.