The jury returned a verdict of suicide during temporary insanity, in accordance with this theory, and, to all outward appearances the case of Mr. Martin was disposed of. But Inspector Whyland, although relieved to feel that yet another unsolved crime had not been added to his already mounting debit account, knew well enough at heart that once again his mysterious adversary had scored a point against him. But again, there was this insoluble riddle of motive. It was possible to suggest more than one motive for the murder of Mr. Martin. He might, for instance, have fallen out with one of the jewel thieves with whom he had such intimate relations. Or again, his dealings with women might have been at the bottom of it. But, assuming one of these suppositions to be correct, how was the death of Mr. Martin to be linked with the previous murders? Or were they indeed all the work of separate persons, who imitated one another’s methods with a view to confusing the issue?