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In this British murder mystery, Scotland Yard investigates a puzzling killing of an Italian count. The Yard assigns a detective, who is to retire the next day, to solve the puzzle. Three people confess the crime. The late count's wife is the daughter of one of them. Apparently the count had abused her. Another of the confessors was in love with the girl. The third confessor's reason is unclear. Eventually the wife, who had been in hiding, steps forward and offers her own confession. Interestingly, none of the four are guilty. Fortunately, by the story's end, the real killer steps forward and justice prevails.