Much against her better judgement, Rina Martin accepts an invitation to join her protégé, Tim, and his fiancée, Joy, at Aitkensthorpe, a country house with a sinister reputation. Gathered there are a collection of scientists, magicians, and experts in the esoteric; their plan is to reenact an incident from 1872 that left one man dead, another driven half mad, and led a third to become a recluse. Rina is relieved when her friend DI MacGregor comes to rescue her. But then the weather closes in, a blizzard cutting them off from the world outside, and Edwin Holmes, grand old man of psychical research, is found murdered in his bed. Trapped in the house with a killer, Mac and Rina must find the culprit.