Gilbert Gildersleeve smiled a sickly smile. It was neck or nothing now. He must go right through with it. "Oh yes," he answered, with prompt conviction, playing a dangerous card well--for how could he know what name this young man Waring might possibly be passing under? "The gentleman who was talking to me when you came in just now. His name's Billington--though, perhaps," he added, after a pause, with a reflective air, "he may have given you another one. Young men will be young men. They've often some reason, when travelling, for concealing their names. Though Billington's not the sort of fellow, to be sure, who's likely to be knocking about anywhere incognito." The landlord laughed. "Oh, we've plenty of that sort," he replied good-humouredly. "Both ladies and gentlemen. It all makes trade. But your friend ain't one of 'em. To tell you the truth, he didn't give any name at all when he came to the hotel; and we didn't ask any. Billington, is it? Ah, Billington, Billington. I knew a Billington myself once, a trainer at Newmarket. Well, he's a very pleasant young man, nice-spoken, and that; but I don't fancy he's quite right in his head, somehow." With instinctive cleverness, Gilbert Gildersleeve snatched at the opening at once. "Ah no, poor fellow," he said, shaking his head sympathetically. "You've found that out already, have you? Well, he's subject to delusions a bit; mere harmless delusions; but he's not at all dangerous. Excitable, very, when anything odd turns up; he'll be calling himself Waring and giving himself in charge for this murder, I dare say, when he comes to hear of it. But as good-hearted a fellow as ever lived, though; only, a trifle obstinate. If you've any difficulty with him at any time, just send for me. I've known him from a boy. He'll do anything I tell him." It was a critical game, but Gilbert Gildersleeve saw something definite must be done, and he trusted to bluster, and a well-known name, to carry him through with it. And, indeed, he had said enough. From that moment forth, the landlord's suspicions were never even so much as aroused by the innocent young man with the preoccupied manner, who knew Mr. Gildersleeve. The great Q.C.'s word was guarantee enough--for any one but himself. And the great Q.C. himself knew it. Why, a chance word from his lips was enough to protect Guy Waring from suspicion. Who would ever believe, then, anything so preposterously improbable as that the great Q.C. himself was the murderer? Not the police, you may be sure; nor the Plymouth landlord.