Detective Constable Oliver Cole has returned home after helping Lancashire Police solve a series of murders in Morecambe to find that his reputation as a puzzle solver is growing. Under pressure from Superintendent Fox, Oliver agrees to stage a week-long puzzle solving course for final year Hendon College graduates, showing them how he looks at the types of clues he's had to deal with and setting some puzzle solving problems for the class. But minutes before the first session is held, the body of a young woman is fished out of the River Tyne. Torn between the responsibility of running the training course and helping with the case, Oliver struggles to focus on either. As a second body is found, fears of another serial killer on the loose force DCI Jack Collier to enlist Oliver's help. But when a 3rd body is found in a familiar graveyard, Oliver begins to wonder if the killer is toying with him

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