After our experience at Whiteladies Christopher Quarles went into Devonshire. He declared that excitement of that kind was a little too much for a man of his years and he must take a long rest to recuperate and get his nerves in order. Under no circumstances whatever was I to bother him with any problems. Had I been able to do so I should have gone away too. Sir Michael Lavory had succeeded in giving me the jumps. In her letters Zena told me the professor was playing golf, and knowing something of him as a golfer, I rather pitied the men he induced to play with him. It was not so much that he was a very bad player, it was the peculiar twist in his brain which convinced him that he was a good one. To give him a hint was to raise his anger at once. One morning I received a letter from him, two pages of golf talk, in which he opined he was playing at about five handicap--pure imagination, of course, because he never kept a card and didn't count his foozled shots--and then he came to the _raison d'etre_ of his letter. "I want you to look up a case," he wrote. "It happened about three years ago. A man named Farrell, partner in the firm of Delverton Brothers of Austin Friars, was found dead in his office. An open verdict was returned. It may have been a case of suicide. Get all the facts you can. If you can obtain any information from some who were interested in the tragedy, do. I am not sure that the result of your inquiries will interest me, but it may. Send me along a full report, it may bring me back to Chelsea, but I am so keen to put another fifty yards on to my drive that I may remain here for three months. Why live in Chelsea when there is such a place as Devonshire?" I remembered that the Delverton case had caused a considerable amount of excitement at the time, and had remained an unsolved mystery, but I knew no more than this. Three years ago I had been away from London engaged on an intricate investigation, with neither time nor inclination to think of anything else. As it happened there was little difficulty in getting a very full account of the affair. It had been in the hands of Detective Southey, since retired, and it was a persistent grievance with him that this case had beaten him. He was delighted to talk about it when I went to see him in his little riverside cottage at Twickenham. Delverton Brothers were foreign bankers, and at the time of the tragedy consisted of three partners, John and Martin Delverton, who were brothers, and Thomas Farrell, their nephew. John Delverton was an invalid, and for a year past had only come to the office for an hour once or twice a week. He had died about six months after the tragedy. One day during a Stock Exchange settlement Thomas Farrell left the office early, and Martin Delverton was there until seven o'clock. When he left the only clerks remaining in the outer office were Kellner, the second in seniority on the staff, and a junior named Small.