England, 1918. A village is being terrorized by kidnappings, grave robberies, and armed zombies emerging from the dark. The police cannot handle it, so private detective Edward Windsor steps in. During a shootout in the village cemetery, he rescues a man named Charles, and the two team up to trace the zombies to a nearby castle. They are separated at the entrance—Edward falls into a subterranean dungeon—and after fighting their way back to each other, Charles is fatally shot. The infection he has been carrying transforms him into a monster, forcing Edward to fight him. Charles mutates further and confronts Edward a second time at the castle laboratory exit.