"Fine dog," he commented, and passed on, after a pat on the Great Dane's head, towards the studio gates.

"Tom," he said to the detective-sergeant who stood near the entrance, "you and Carroll had better check up on all the players present, as well as any stray visitors, first chance you get. Might as well play safe. You can tell them in the office to let the bars down now, but see that a careful tab is kept on all those leaving the studio. I'll be running down to Headquarters now, after a bite."

"Okay, Inspector," said the sergeant succinctly and lumbered away.

Dawson of the Blade was still with Corot when the police car came to a grinding halt in front of New York's sombre Police Headquarters. But all his questioning of the inspector on the way downtown had got him—exactly nothing. Not until Corot was in his swivel chair in his private office and had lighted his pipe was he ready to talk to the reporter.

"YOU say you've got to know what I think of this case?" he asked. "Well," he went on frankly, "at this minute that murder is as much of a mystery to me as it is to you, Dawson. In fact, the element of time—the lights could not have been out but a few minutes—and the whereabouts of that peculiar knife, one not easily concealed, are the things we're butting our heads on."

The head of the Homicide Squad puffed thoughtfully at his pipe.

"Of course there must be a motive for murder," he continued. "But there are motives— and motives! For admission, we have the admission of the director, Boone, that he was in love with his leading lady, had thought her favorably inclined to his proposal of marriage, until she suddenly turned him down. And she did tell him there was another man! Moreover, there's the bolo. We'll learn about that later."