Thief, criminal and probably a coward, would Hyson have had the courage to kill himself or did someone catch up with him? Did his death have anything to do with Mrs Telford, who committed suicide shortly before?

The Inspector, anticipating a routine investigation, finds conflicting stories, poison pen letters, and damning information about Hyson. It takes Sir Clinton Driffield to untangle the case and prove that the cast-iron alibi is the one which should arouse suspicion.