One obviously. Some five or six weeks ago a fairly tall, well-built man of middle age had disappeared. He might merely have vanished without explanation, or more probably, circumstances had been arranged to account for his absence. In the first case, information should be easily obtainable. But the second alternative was a different proposition. If the disappearance had been cleverly screened it might prove exceedingly difficult to locate. At all events, enquiries on the matter must represent the first step. It was clearly impossible to trace any of the clothes, with the possible exception of the sock. But even from the sock French did not think he would learn anything. It was of a standard pattern and the darning of socks with wool of not quite the right shade was too common to be remembered. At the same time he noted it as a possible line of research. Next he turned his attention to the crate, and at once two points struck him. Could he trace the firm who had made the crate? Of this he was doubtful; it was not sufficiently distinctive. There must be thousands of similar packing cases in existence, and to check up all of them would be out of the question. Besides, it might not have been supplied by a firm. The murderer might have had it specially made or even have made it himself. Here again, however, French could but try. The second point was: How had the crate got to the bottom of the Burry Inlet? This was a question that he must solve, and he turned all his energies towards it. There were here two possibilities. Either the crate had been thrown into the water and had sunk at the place where it was found, or it had gone in elsewhere and been driven forward by the action of the sea. He considered these ideas in turn. To have sunk at the place it was thrown in postulated a ship or boat passing over the site. From the map, steamers approaching or leaving Llanelly must go close to the place, and might cross it. But French saw that there were grave difficulties in the theory that the crate had been dropped overboard from a steamer. It was evident that the whole object of the crate was to dispose of the body secretly. The crate, however, could not have been secretly thrown from a steamer. Whether it were let go by hand or by a winch, several men would know about it. Indeed, news of so unusual an operation would almost certainly spread to the whole crew, and if the crate were afterwards found, some one of the hands would be sure to give the thing away. Further, if the crate were being got rid of from a steamer it would have been done far out in deep water and not at the entrance to a port. For these reasons French thought that the ship might be ruled out and he turned his attention to the idea of a rowboat.