Mulder and Scully are called in to investigate a series of murders where the victims are all in some way related to a wealthy, well-educated doctor. As they search for clues the FBI agents discover the apparent motive is revenge. Years ago the doctor was involved in the euthanasia of a young girl on the verge of death. Once again, Mulder must race against time to find who is behind the killings before the doctor and (more importantly) Scully become the next victims.