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 jected a dozen plans. Then, on the thirteenth, came the opportunity: all the conditions adjusted themselves to his purpose. He heard Miss St. Clair's promise to go to dinner; and he therefore knew that Alvin would prob'bly be home alone at twelve-thirty, and that, if he were done away with at that hour, suspicion would fall on Captain Leacock. He saw Alvin take home the jewels—another prov'dential circumst'nce. The propitious moment for which he had been waiting, d' ye see, was at hand. All that remained was to establish an alibi and work out a modus operandi. How he did this, I've already eluc'dated."

Markham sat thinking for several minutes. At last he lifted his head.

"You've about convinced me of his guilt," he admitted. "But damn it, man! I've got to prove it; and there's not much actual legal evidence."

Vance gave a slight shrug.

"I'm not int'rested in your stupid courts and your silly rules of evidence. But, since I've convinced you, you can't charge me with not having met your challenge, don't y' know."

"I suppose not," Markham assented gloomily.

Slowly the muscles about his mouth tightened.

"You've done your share, Vance. I'll carry on."

Heath and Captain Hagedorn were waiting when we arrived at the office, and Markham greeted them in his customary reserved, matter-of-fact way. By now he had himself well in hand, and he went about the task before him with the sombre forcefulness that characterized him in the discharge of all his duties.