Before the man could frame an answer, Vance stood up and leaned impressively over the District Attorney’s desk.

“You know a Miss Frisbee. Lives in 71st Street; accurately speaking—at number 184; to be more exact—in the house where Miss Odell lived; to put it precisely—in Apartment Number 2. Miss Frisbee was a former model of yours. Sociable girl: still charitable to the advances of her erstwhile employer—meanin’ yourself.—When did you see her last, Mr. Mannix? . . . Take your time about answering. You may want to think it over.”

Mannix took his time. It was a full minute before he spoke, and then it was to put another question.

“Haven’t I got a right to call on a lady—haven’t I?”

“Certainly. Therefore, why should a question about so obviously correct and irreproachable an episode make you uneasy?”

“Me uneasy?” Mannix, with considerable effort, produced a grin. “I’m just wondering what you got in your mind, asking me about my private affairs.”

“I’ll tell you. Miss Odell was murdered at about midnight Monday. No one came or went through the front door of the house, and the side door was locked. The only way any one could have entered her apartment was by way of Apartment 2; and nobody who knew Miss Odell ever visited Apartment 2 except yourself.”

At these words Mannix leaned over the table, grasping the edge of it with both hands for support. His eyes were wide and his sensual lips hung open. But it was not fear that one read in his attitude; it was sheer amazement. He sat for a moment staring at Vance, stunned and incredulous.

“That’s what you think, is it? No one could’ve got in or out except by Apartment 2, because the side door was locked?” He gave a short vicious laugh. “If that side door didn’t happen to be locked Monday night, where’d I stand then—huh? Where’d I stand?”

“I rather think you’d stand with us—with the District Attorney.” Vance was watching him like a cat.