“I’ll call up the Bureau,” he decided, “and see what Guilfoyle had to report. At least we’ll know then when the Dude left his house.”

But when the Sergeant had been connected with Police Headquarters he was informed that Guilfoyle had as yet made no report.

“That’s damn funny,” he commented, hanging up the receiver.

It was now twenty minutes past ten. Markham was growing restive. The tenacity with which the Canary murder case had resisted all his efforts toward a solution had filled him with discouragement; and he had hoped, almost desperately, that this morning’s interview with Skeel would clear up the mystery, or at least supply him with information on which definite action could be taken. Now, with Skeel late for this all-important appointment, the strain was becoming tense.

He pushed back his chair nervously and, going to the window, gazed out into the dark haze of fine rain. When he returned to his desk his face was set.

“I’ll give our friend until half past ten,” he said grimly. “If he isn’t here then, Sergeant, you’d better call up the local station-house and have them send a patrol-wagon for him.”

There was another few minutes of silence. Vance lolled in his chair with half-closed eyes, but I noticed that, though he still held his cigarette, he was not smoking. His forehead was puckered by a frown, and he was very quiet. I knew that some unusual problem was occupying him. His lethargy had in it a quality of intentness and concentration.

As I watched him he suddenly sat up straight, his eyes open and alert. He tossed his dead cigarette into the receiver with a jerky movement that attested to some inner excitation.

“Oh, my word!” he exclaimed. “It really can’t be, y’ know! And yet”—his face darkened—“and yet, by Jove, that’s it! . . . What an ass I’ve been—what an unutterable ass! . . . Oh!”

He sprang to his feet; then stood looking down at the floor like a man dazed, afraid of his own thoughts.