Caldew had not been impressed with Merrington's handling of the case. Subordinates rarely are impressed with the qualities of those placed over them in authority. They generally imagine they could do better if they had the same opportunities. Caldew was no exception to that rule. It seemed to him that Merrington lacked finesse, and was out of touch with modern methods of criminal investigation. He had been spoilt by too much success, by too much newspaper flattery, by too many jaunts with Royalty. No man could act as sheep-dog for Royalty and retain skill as a detective. That kind of professional work was fatal for the intelligence. Merrington had a great reputation behind him, and his knowledge of European criminals was probably unequalled, but his methods of investigating the moat-house murder suggested that he was no longer one of the world's greatest detectives, if, indeed, he had ever deserved recognition in their ranks. Caldew recalled that his fame rested chiefly on his wide experience rather than on the more subtle deductive methods of modern criminology. It was said in Scotland Yard that when Merrington was at the height of his reputation, twenty years before, his knowledge of London criminals and their methods was so extensive that he could in most cases identify the criminal by merely looking at his handiwork. As a modern criminologist, Caldew believed that the less a detective intruded his own personality into his investigations the better for his chances of success. He did not think that the loud officialism of Merrington was likely to solve such a deep, subtle crime as the murder of Violet Heredith, and, consequently, he had the chance for which he had waited so long. It now remained for him to prove that he could do better than Merrington. He had sufficient confidence in his own abilities to welcome the opportunity, but at the same time he believed that he was confronted with a crime which would tax all his resources as a detective to unravel. Like Merrington, he had been struck by the strangeness of the murder. All the circumstances were unusual, and quite outside his previous experience of big crimes. He had also come to the conclusion that the ease with which the murderer had found his way into the moat-house, and afterwards escaped, pointed to an intimate knowledge of the place.