An unknown person killed euthanasia advocate Eldon Mate (Doctor Death), responsible for dozens of suicides carried out with his help. The case is entrusted to Milo Sturgis, a veteran of the Los Angeles Police homicide department, and he turns to his friend, psychologist Alex Delaware, for help. Finding the killer is not easy. New circumstances of the case further complicate an already difficult and confusing investigation. But the criminal cannot foresee everything...