Austin had waited a moment, but now he continued:

‘I need hardly say we were speechless from consternation. Our first thought was to run for help—Cosgrove to Luce Manor, while I took my boat across for Dr Graham. But this, we saw, would involve disclosing the secret, and we hurriedly consulted in the hope of finding a way of avoiding the revelation. And then it flashed across our minds what a dreadful position we ourselves occupied. Might we not be suspected of murder? Here we had come secretly to the boathouse, having devised elaborate alibis to prove ourselves elsewhere. Though these alibis were not completed, enough had been done to make the whole business exceedingly fishy. We recollected that both Cosgrove and I not only stood to gain fortunes by the death, but were also, both of us, in special need of money at the moment. Then it was known I did not get on well with my father …

‘I need not elaborate the case; no doubt, Mr Tanner, you considered these matters before you arrested us. All I have to say is that we became panic-stricken and lost our heads. We made an appalling blunder. Instead of going for help and telling the truth, we decided to arrange the circumstances to suggest accident, and trust to our alibis in case suspicion should be aroused. It was so easy, for the plan had already been worked out to frighten Dale. We talked it over quickly, and thought we might improve on it.

‘We saw at once that it would seem much more natural if we suggested that my father had taken out a boat of which he had lost control, and had been carried over the falls. The injuries the body would get in the rapids below, would, we imagined, account for the bruise on the back of the head. By throwing the oars into the water nearer the other side of the river, they would not go ashore with the boat, indicating that my father had lost them, and thus explaining the accident.

‘The only thing unaccounted for was the motive which had caused my father to take out a boat at this hour. To meet this difficulty I made an entry in a small engagement book I found in his pocket, “Graham, 9.00 p.m.” I hoped it would be assumed he wished to make a private call on the doctor.

‘There is little more to be told. We lifted the body into one of my father’s boats, and I towed it out and set it adrift, dropping the oars in some distance away. Then I returned to the Halford Clubhouse, knocked up the attendant, and called on Miss Drew, all as you know. About three in the morning I put on the shoes I had kept hidden, slipped out of the house and made the tracks to the Abbey ruin, returning without my absence having been noticed. I put the shoes back in their hiding-place and next day, having sent my man on an errand, I cleaned them and changed them for the other pair. This latter pair I afterwards destroyed. The pair which had made the traces at the Abbey (the sole of one of which I had marked) was thus left in my man’s charge, and he was prepared to swear—quite honestly—that they had only been out of his possession at the time of the alleged hoax. Is there anything else you wish to know?’

Tanner asked a few questions, all of which Austin answered with the utmost readiness. Then, after receiving an assurance that his statement would receive the most careful attention of the authorities, the meeting came to an end. Austin was led out, and after a few words of conversation, Lois and Daunt took their leave.

Chapter XVI.
Conclusion

The doubts which Inspector Tanner had experienced as to the truth of Austin’s statement were short-lived. After a careful consideration of the story, Austin was subjected to a most searching examination on small details—such points and so many of them as no trio of conspirators could possibly have foreseen and provided for. Cosgrove, who made a statement similar to Austin’s, was also tested upon these points, and his answers convinced the authorities that at last the truth was known. At his request the false confession of blackmail, signed ‘Edward Dale,’ was given up by Miss Belcher, to whom it had been handed for safety. But what cleared the last shreds of doubt from the minds of those concerned was the statement of Dale. Not only did his testimony agree with that of the others, both generally and on the small matters in question, but he went further than either of them. He confessed fully that his action had been the cause of the tragedy, stating, which neither of the others, had done, that he had actually pushed Sir William back. He swore most positively he had no idea of injuring the manufacturer, nor had he noticed the rope or thought about the other’s tripping.

It was clear to the authorities that with any ordinary jury the defence would win, and indeed, both Tanner, his Chief, and the Crown Prosecutor themselves believed the explanation given by the three prisoners. The case against Austin and Cosgrove was therefore unconditionally withdrawn, and they were set at liberty.