Cop is a 1988 American neo-noir crime suspense film written and directed by James B. Harris, starring James Woods, Lesley Ann Warren and Charles Durning. It is based on the 1984 book Blood on the Moon, by James Ellroy. Harris and Woods co-produced the film, a first for their careers. Plot LAPD detective Sgt. Lloyd Hopkins (Woods) discovers the brutal murder of a young woman. Hopkins notices a great deal of feminist literature with titles like Rage in the Womb on her bookshelf. He also sees two classified ads for anonymous sexual encounters. When he returns home, his 8-year-old daughter wakes up and begs him for a story. He launches into a profane description of one of his cases, much to the girl's delight. His wife orders him to stop, and they have an argument over the inappropriateness of his stories. Frustrated, he calls up his buddy Dutch Peltz (Durning), and they go on a stakeout, which culminates with Hopkins shooting the suspect. Hopkins asks Dutch to stay at the scene and file the paperwork so that he can take the suspect's voluptuous girlfriend home and have sex with her. Hopkins tracks down Joanie Pratt (Brooks) through the classified ads at the victim's apartment. Pratt is a washed-out actress who sells drugs and works as an escort to get by. She also hosts swinger parties, and the victim was planning on attending one of the parties to research a book. Back at the station, Hopkins opens a letter that was sent to the victim. It is a poem written in blood, which refers to "all the rest", making Hopkins think he is hunting a serial killer. He asks Dutch to get him all the files for unsolved murders of single women in the past 15 years. When he returns home, he finds a note from his wife explaining that she has taken their daughter and left. Pratt phones Hopkins, and he goes over to her place to have sex. After narrowing down the unsolved murders to a few cases, Hopkins summons Deputy Sheriff Delbert "Whitey" Haines (Haid) to a meeting and brusquely interrogates him about two suicides that took place on June 10 a year apart on his beat. Hopkins goes to Haines' apartment and discovers a wiretap which has captured Haines dealing drugs. In the process of canvassing feminist bookstores for leads, Hopkins visits one run by Kathleen McCarthy