From the attendant at the boat club pavilion he should be able to learn if Austin did take out a boat, and if so, at what hour. Possibly other persons in the club might have been present, and could substantiate this point. The attendant would also know the hour at which he was called out on Austin’s return. The Drews would certainly have remarked the time of Austin’s call, and lastly, the latter’s own servants would be sure to remember the hour of his return. There should be ample—indeed overwhelming—evidence of the times at which Austin set out with his boat and returned. So far so good, but it was clear to Tanner that if he could get no further corroboration than this, the whole alibi was worthless. One point—but that a vital point—would remain unsubstantiated. Austin might have left and returned at the hours he stated, but where was he between them? Did he go to the Abbey and the Franklyns’? If he did, he could not have been to Luce Manor, and necessarily was innocent. How was this to be ascertained? There were, of course, the footprints. That these were made by Austin’s shoes was beyond question. The fact that the latter were new prevented the marks showing the individuality that might otherwise have been expected, but against that, at one point on the edge of the left sole there was a slight dint—caused possibly by striking a stone—and this dint was faithfully reproduced in the prints. It was too much to suppose that two separate pairs of similar shoes should have similar dints. But two other points were by no means beyond question. Though it was certain that Austin’s shoes had passed over that ground, how could it be proved that Austin was then wearing them? How, again, could it be known that they were made at the time stated? Could not Austin really have been at Luce Manor on that evening, and have made the tracks to the Abbey at some other time? Tanner was puzzled. He did not see how this point was to be cleared up. Next morning he began his investigation at the pavilion of the Halford boat club. It was quite a large place, situated on a kind of bay on the river, just below the town. The house was built of red brick, with heavy overhanging eaves, and a kind of piazza in front. Before the piazza and stretching a good way past it in each direction, was the wharf wall, with several broad flights of steps leading to the river. Out on the water were moored some dozen or more boats, and others were in the railed-off space surrounding the house. Tanner pushed open the gate of this railing and entered. At first he could see no one about, then, as he walked round the house, he came on a youngish man in a cap and a blue jersey, who was washing out one of the boats. He hailed him, and they got into conversation in a leisurely way. Tanner praised the house and general appearance of the place, and then gradually came to the object of his call.