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Sam Irwin, actor, is found dead in the River Thames. It appears to be suicide. But why should he have taken his own life shortly before opening in a new play at the Royal Shakespeare Theatre at Stratford-upon-Avon? In arriving at a conclusion, Dr. Patrick Grant, a friend of Irwin, manages to link the seemingly unconnected occurrences of the death of a dog, a further suicide, and a series of art robberies. That, however, is only the prelude to a massive deception. Grant himself is threatened, and unless he can escape unscathed from a concert at the Festival Hall, the secret of Irwin's death will die with him.