Door with Seven Locks

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