A schoolgirl executed by hanging for having an affair with a teacher was taken to the morgue for an autopsy. The pathologist examines the strangulation furrow on the neck of the corpse and analyzes the fibers of the rope remaining in the strangulation furrow. To establish the mechanism of asphyxia, the pathologist uses illustrations from the atlas for the medical examiner. She looks at photographs of various corpses and comes to photographs of hanged and strangled people. There she accidentally stumbles upon a photograph of a dead man with a collar around his neck. She was interested in the photo and decided to read the annotation to it. It turned out to be an autoerotic hanging. The pathologist learns that strangulation during masturbation enhances the sensations and decides to test it for himself. She removes the strap from her waist and begins to strangle herself. At the same time, she masturbates. But that's not enough. She decides to fix the strap on a fixed surface and pull her neck back so that the sensations are maximized. At the moment of orgasm, squeezing the neck turns out to be fatal