“Well, there are only four men of the type you describe who could have had any remote reason for murdering the Odell woman. Heath’s scouts went into her history pretty thoroughly, and for over two years—that is, since her appearance in the ‘Follies’—the only personæ gratæ at her apartment have been Mannix, Doctor Lindquist, Pop Cleaver, and, of course, Spotswoode. The Canary was a bit exclusive, it seems; and no other man got near enough to her even to be considered as a possible murderer.”

“It appears, then, that you have a complete quartet to draw on.” Vance’s tone was apathetic. “What do you crave—a regiment?”

“No,” answered Markham patiently. “I crave only one logical possibility. But Mannix was through with the girl over a year ago; Cleaver and Spotswoode both have water-tight alibis; and that leaves only Doctor Lindquist, whom I can’t exactly picture as a strangler and meretricious burglar, despite his irascibility. Moreover, he, too, has an alibi; and it may be a genuine one.”

Vance wagged his head.

“There’s something positively pathetic about the childlike faith of the legal mind.”

“It does cling to rationality at times, doesn’t it?” observed Markham.

“My dear fellow!” Vance rebuked him. “The presumption implied in that remark is most immodest. If you could distinguish between rationality and irrationality you wouldn’t be a lawyer—you’d be a god. . . . No; you’re going at this thing the wrong way. The real factors in the case are not what you call the known circumstances, but the unknown quantities—the human x’s, so to speak—the personalities, or natures, of your quartet.”

He lit a fresh cigarette, and lay back, closing his eyes.

“Tell me what you know of these four cavalieri serventi—you say Heath has turned in his report. Who were their mamas? What do they eat for breakfast? Are they susceptible to poison-ivy? . . . Let’s have Spotswoode’s dossier first. Do you know anything about him?”

“In a general way,” returned Markham. “Old Puritan stock, I believe—governors, burgomasters, a few successful traders. All Yankee forebears—no intermixture. As a matter of fact, Spotswoode represents the oldest and hardiest of the New England aristocracy—although I imagine the so-called wine of the Puritans has become pretty well diluted by now. His affair with the Odell girl is hardly consonant with the older Puritans’ mortification of the flesh.”