The Door with Seven Locks

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Dick Martin is on his last day on the job at Scotland Yard, having planned to retire early due to an inheritance windfall, when he becomes entangled in a strange and convoluted mystery involving a missing heir, a stolen library book, vivisection, a series of murders and a mysterious tomb with a complicated and unique set of locks, the keys of which have been scattered to the winds. But as the pieces start to come together, what seems at first a series of odd and random coincidences begin to add up to a sinister plot to seize a fortune!