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Four strangers arrive at the solicitors´ office of Puckle, Puckle, and Nunnery. They have never met, and have no idea why they have been invited. But they - along with a missing man - are descendants of the late Algernon George Culver Mayton, the inventor of "Mayton´s Marvellous Mixture" and each entitled to a portion of the Mayton Fortune. But before they can split the money, the missing man must be found. They begin their search, but then Detective Sloan receives a call that one of the legatees had died following an attack of food poisoning. Now detectives Sloan and Crosby must determine whether the deceased merely ingested a noxious substance by accident, or if the legatees are being picked off one-by-one. And when matters of money and family rivalry are involved, there is almost certainly foul play afoot.

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