This is the second in the series of cases involving Inspector Morimoto and his assistant, Officer Suzuki. Using the methods of deductive reasoning that they employed so successfully in their earlier case Inspector Morimoto and the Two Umbrellas, Morimoto and Suzuki encounter some intriguing puzzles centered around an expensive piece of diamond jewelry. If the branch manager of the Metropolitan Trust Bank has been dabbling in burglary during his spare time, then an enormous scandal is surely about to break out. And how are the wealthy owner of the downtown kimono shop and the no-nonsense manager of the Okayama Central Hospital connected to the case?
Morimoto and Suzuki know that the insurance company is monitoring them closely as they sort through the baffling events. And as usual, the Chief of Police is very concerned about the reputation of his Police Department, particularly since some of the people involved carry considerable influence with the City Council. Nevertheless, unperturbed by the fact that almost everybody becomes impatient with them for one reason or another, Morimoto and Suzuki carefully construct an astonishing theory