8MM
Tags: mystery, cruelty, murder, neo noir, cult, revenge, violence, suspenseful, sadist

Plot synopsis:
Private investigator Tom Welles is contacted by Daniel Longdale, attorney for wealthy widow Mrs. Christian, whose husband has recently died. While clearing out her late husband's safe, she and Mr. Longdale find an 8 mm movie which appears to depict a real murder, but Mrs. Christian wants to know for certain.
After looking through missing persons files, Welles discovers the girl is Mary Ann Mathews, and visits her mother, Janet Mathews. While searching the house with her permission, he finds Mary Ann's diary, in which she says she went to Hollywood to become a film star. He asks Mrs. Mathews if she wants to know the truth, even if it is the worst. She says that she wants to know what happened to her daughter.
In Hollywood, with the help of an adult video store employee called Max California, Welles delves into the underworld of illegal pornography. Contact with a sleazy talent scout named Eddie Poole leads them to director Dino Velvet, whose violent pornographic films star a masked man known as "Machine." To gain more evidence, Welles pretends to be a client interested in commissioning a hardcore bondage film to be directed by Velvet and starring Machine. Velvet agrees and arranges a meeting in New York City.
At the meeting, attorney Longdale appears and explains that Christian had contracted him to procure a snuff film. Longdale says that he told Velvet that Welles might come looking for them. Realizing that the snuff film was authentic, Welles knows he is at risk. Velvet and Machine produce a bound and beaten California, whom they abducted to force Welles to bring them the only surviving copy of the illegal film. Once he delivers it, they burn it and kill California. As they are about to kill Welles, he tells them that Christian had paid $1,000,000 for the film. Velvet, Poole, and Machine received much less and that Longdale kept the major portion. In an ensuing fight, Velvet and Longdale are both killed; Welles wounds Machine and escapes.
He calls Mrs. Christian to tell her his discoveries and recommends going to the police, to which she agrees. Arriving at her estate, Welles is told that Mrs. Christian committed suicide after hearing the news. She left envelopes for the Mathews family and Welles: it contains the rest of his payment and a note reading, "Try to forget us."
Welles decides to seek justice for the murdered girl by killing the remaining people involved. Tracking down Poole, Welles takes him to the shooting location and tries to kill him. He calls Mrs. Mathews to tell her about her daughter and asks for her permission to punish those responsible. With that, he returns and pistol-whips Poole to death, burning his body and pornography from his car. Welles traces Machine and attacks him at home. Welles unmasks him, revealing a bald, bespectacled man named George. He says, "What did you expect? A monster?" George goes on telling Welles that he has no ulterior motive for his sadistic actions; he does them simply because he enjoys it. They struggle, and Welles kills him.
After returning to his family, Welles receives a letter from Mrs. Mathews, thanking him and suggesting he and she were the only ones to care about Mary Ann.