Markham sent Swacker for Tracy; and when the latter arrived, suave and beaming, he was given instructions to take the District Attorney’s car and bring Mannix to the office.

“Get a subpœna,” said Markham; “and use it if necessary.”

Half an hour or so later Tracy returned.

“Mr. Mannix made no difficulty about coming,” he reported. “Was quite agreeable, in fact. He’s in the waiting-room now.”

Tracy was dismissed, and Mannix was ushered in.

He was a large man, and he walked with the forced elasticity of gait which epitomizes the silent struggle of incipiently corpulent middle age to deny the on-rush of the years and cling to the semblance of youth. He carried a slender wanghee cane; and his checkered suit, brocaded waistcoat, pearl-gray gaiters, and gaily beribboned Homburg hat gave him an almost foppish appearance. But these various indications of sportiveness were at once forgotten when one inspected his features. His small eyes were bright and crafty; his nose was bibative, and appeared disproportionately small above his thick sensual lips and prognathous jaw. There was an oiliness and shrewdness in the man’s manner which were at once repulsive and arresting.

At a gesture from Markham he sat down on the edge of a chair, placing a podgy hand on each knee. His attitude was one of alert suspicion.

“Mr. Mannix,” said Markham, an engaging note of apology in his voice, “I am sorry to have discommoded you; but the matter in hand is both serious and urgent. . . . A Miss Margaret Odell was murdered night before last, and in the course of our inquiries we learned that you had at one time known her quite well. It occurred to me that you might be in possession of some facts about her that would assist us in our investigation.”

A saponaceous smile, meant to be genial, parted the man’s heavy lips.

“Sure, I knew the Canary—a long time ago, y’ understand.” He permitted himself a sigh. “A fine, high-class girl, if I do say so. A good looker and a good dresser. Too damn bad she didn’t go on with the show business. But”—he made a repudiative motion with his hand—“I haven’t seen the lady, y’ understand, for over a year—not to speak to, if you know what I mean.”