want any one to know he was there. Why should he have staged such a masterpiece of idiocy? That certainly isn't the explanation. When we find the answer it will be reasonable and simple."
"That's encouraging," smiled Markham. "But proceed with your reasons for Spotswoode's guilt."
"Three of my quartet, then, were potential murderers," Vance resumed. "Accordingly, I requested an evening of social relaxation, that I might put them under the psychological microscope, as it were. Although Spotswoode's ancestry was wholly consistent with his having been the guilty one, nevertheless I confess I thought that Cleaver or Mannix had committed the crime; for, by their own statements, either of them could have done it without contradicting any of the known circumstances of the situation. Therefore, when Mannix declined your invitation to play poker last night, I put Cleaver to the first test. I wig-wagged to Mr. Allen, and he straightway proceeded to perform his first feat of prestidigitation."
Vance paused and looked up.
"You perhaps recall the circumstances? It was a jack-pot. Allen dealt Cleaver a four-straight-flush and gave me three kings. The other hands were so poor that every one else was compelled to drop out. I opened; and Cleaver stayed. On the draw, Allen gave me another king, and gave Cleaver the card he needed to complete his straight-flush. Twice I bet a small amount, and each time Cleaver raised me. Finally I called him, and, of course, he won. He couldn't help but win, d' ye see. He was betting on a sure-thing. Since I opened the pot and drew two
