"There were one hundred thousand dollars worth of unset diamonds in that store tonight," Black Hood said. "And that's what this man who is posing as the Eye went after and got. The past record shows that none of these crimes have been what you could call petty." "A fact," McGinty said, "which doesn't prove you haven't hid the diamonds somewhere." "But kept a few of them on my person just to get myself in jail, huh?" Black Hood laughed. "Listen, McGinty, why do you suppose Biggert, Weedham's secretary, was killed?" "The shot that killed Biggert was intended for Jack Carlson," McGinty said. "So it was an accident that Biggert was shot." Black Hood shook his head, "Jack Carlson was nowhere near Biggert when the latter fell. That was no mistake. Biggert was killed because he was about to expose somebody who had forged that check which is lying on your desk. That check is the piece of paper that was in Biggert's hand when he died." McGinty's eyes narrowed. "How did you get hold of that, Mr. Hood?" Black Hood saw that he would have to lie in order to protect his prototype, Kip Burland. "I reached the body of Biggert before Carlson or anyone else did. That's how I know Carlson wasn't near the man when the shot was fired." McGinty thought that over a moment. "Go ahead, Mr. Hood. I'm not convinced, but every man has a right to free speech." "Did the police notice the smudge of white powder on the lapel of Carlson's coat when they found his body? Did they notice that the regular light bulbs in his garage had been replaced with ultra-violet bulbs?" McGinty nodded. "Our lab men don't miss much. That smudge of powder contained some chemical that glows in black light. I figured it spotted Carlson for the killer, made a target out of him in the dark." "Right, McGinty. But do you know that Carlson was betrayed by a woman named Vida Gervais? She lives in the house next to the Weedham place. That powder box which you took from my pocket and which is now on your desk, is a sample of her face powder, treated with naphthionate of sodium. You can prove that yourself. And if you'll question the lady thoroughly, you'll be able to get at the truth. She'll know that Carlson was the Eye. And she may even admit that she threw Carlson over and helped somebody else dispose of Carlson and step into the lucrative position which Carlson occupied as the Eye." McGinty looked up at one of his men. "Send out for that Gervais dame." When the man had left the room, he turned to Black Hood. "You haven't cleared yourself yet. You claim Carlson was the Eye. That's the world's oldest alibi--putting the blame on a dead man." "I can prove Carlson was the Eye," Black Hood persisted. "In the morning I will send you that signal device which the Eye used. It carries Carlson's fingerprints." "You'll send it from jail, then," McGinty said. * * * * *