“It occurs to me,” said Markham, when Swacker had gone, “that this car episode may prove helpful, after all. Pfyfe was evidently in New York that night, and for some reason he didn’t want it known. Why, I wonder? He tipped us off about Leacock’s threat against Benson, and hinted strongly that we’d better get on the fellow’s track. Of course, he may have been sore at Leacock for winning Miss St. Clair away from his friend, and taken this means of wreaking a little revenge on him. On the other hand, if Pfyfe was at Benson’s house the night of the murder, he may have some real information. And now that we’ve found out about the car, I think he’ll tell us what he knows.”

“He’ll tell you something anyway,” said Vance. “He’s the type of congenital liar that’ll tell anybody anything as long as it doesn’t involve himself unpleasantly.”

“You and the Cumæan Sibyl, I presume, could inform me in advance what he’s going to tell me.”

“I couldn’t say as to the Cumæan Sibyl, don’t y’ know,” Vance returned lightly; “but speaking for myself, I rather fancy he’ll tell you that he saw the impetuous Captain at Benson’s house that night.”

Markham laughed.

“I hope he does. You’ll want to be on hand to hear him, I suppose.”

“I couldn’t bear to miss it.”

Vance was already at the door, preparatory to going, when he turned again to Markham.

“I’ve another slight favor to ask. Get a dossier on Pfyfe—there’s a good fellow. Send one of your innumerable Dogberrys to Port Washington and have the gentleman’s conduct and social habits looked into. Tell your emiss’ry to concentrate on the woman question. . . . I promise you, you sha’n’t regret it.”

Markham, I could see, was decidedly puzzled by this request, and half inclined to refuse it. But after deliberating a few moments, he smiled, and pressed a button on his desk.