A medical research institute is terrorised by a maniac disguised as the Grim Reaper. When a doctor is found dead with arrows jutting from his back, alleged psychic Sarah Pensall warns Murdoch that he will be the killer's final victim.
Tropes:
- Couldn't Find a Pen: The Victim of the Week writes the letters "W Y" in his own blood on a rock after he is shot in the back with an arrow.
- In the Hood: The killer conceals their identity in a Grim Reaper costume with a large hood.
- Locard's Theory: Constable Crabtree speaks a bit despairingly of the culprit's escape from a murder scene without a trace early in the episode. Murdoch reassures him thusly:Murdoch: The laws of physics dictate that any time two objects make contact, trace materials are exchanged. Therefore, a killer always leaves a calling card.
- Obfuscating Disability: The killer turns out to be someone who pretended to be a stroke victim so he would avoid suspicion.
- Paranormal Episode: Sarah Pensall goes undercover at a hospital-cum-institute that studies people with unusual brain conditions. She holds another séance to attempt contact with a young woman patient who died some years previously, and she is troubled by a vision of Murdoch's impending death.
