he was unprepared for the latter's statement that he might be able to solve the Odell murder by means of it. Yet Vance had spoken with such undoubted earnestness that Markham was impressed. I knew what was passing in his mind almost as well as if he had voiced his thoughts. He was recalling the way in which Vance had, in a former murder case, put his finger unerringly on the guilty man by a similar process of psychological deduction. And he was also telling himself that, however incomprehensible and seemingly extravagant Vance's requests were, there was always a fundamentally sound reason behind them.
"Damn it!" he muttered at last. "The whole scheme seems idiotic. . . . And yet, if you really want a game of poker with these men, I've no special objection. It'll get you nowhere—I'll tell you that beforehand. It's stark nonsense to suppose that you can find the guilty man by such fantastic means."
"Ah, well," sighed Vance, "a little futile recreation will do us no harm."
"But why do you include Spotswoode?"
"Really, y' know, I haven't the slightest notion—except, of course, that he's one of my quartet. And we'll need an extra hand."
"Well, don't tell me afterwards that I'm to lock him up for murder. I'd have to draw the line. Strange as it may seem to your layman's mind, I wouldn't care to prosecute a man, knowing that it was physically impossible for him to have committed the crime."
"As to that," drawled Vance, "the only obstacles that stand in the way of physical impossibilities are
