A university professor is found with a stake through her heart on Hallowe'en. A medium, who claims to have foreseen the death, conducts a séance, but Lewis and Hathaway rely on more conventional methods to solve the murder.
The Master of Gresham College is found dead in suspicious circumstances. His widow supected that he had been having an affair, but Lewis and Hathaway discover that the dead man had a curious obsession.
A man's body is discovered on a tour bus, but none of the passengers can remember him being on board. The investigation leads Lewis and Hathaway to the estate where Hathaway grew up, and the detectives are soon investigating a second murder.
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