Ed is murdered prior to boarding and the killer dresses himself in Ed's Groucho Marx mask, allowing him to board the train unnoticed. As the train journeys into the wilderness, the killer wanders amongst the students, who believe him to be Ed. In the sleeper bathroom, he murders Jackson by smashing his head into a mirror. Carne finds Jackson's bloodied body in the bathroom, still donning the lizard costume. When Carne returns to the scene with the brakemaster Charlie, the killer has hidden Jackson's body and is now posing in the lizard costume; as he appears conscious, Charlie assures Carne that the partygoer was merely drunk.