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Money wranglers appear to be the motive for murder when the body of an American entrepreneur is fished out of the Thames.
While Inspector Witherspoon is assigned to the case, his housekeeper, Mrs. Jeffries, conducts her own secret investigation, delving into the business world where a handful of influential men, including one of the inspector's police colleagues, appear to have been defrauded.
The murder victim had sold them shares in a Colorado silver mine but they subsequently discovered that the mine doesn't exist. Money being such a powerful motive for murder, Mrs. Jeffries considers all of the investors to be suspects - but which one is actually killer?