“At midnight, Inspector! The first watchman is on duty from six o’clock—when we close—till twelve, when poor Mason relieved him. I’ve sent for Druce—that’s the other watchman—he should be along here in a few moments.”

“Well, this poor fellow in the other room can’t tell us anything—so we shall have to rely on Druce. I hope he will be of some help.”

“Was he found dead in this room, Inspector?” asked Linnell—“or——”

“Just over there”—pointed Goodall to a spot about a dozen yards away—“right in front of the handrail. Doctor Archer examined him first down there—then we had him taken into Mr. Day’s private office.”

“Where the rug is?” interrogated Linnell. He looked at the rug on the floor.

“That’s it,” answered Goodall. “There’s a nasty mess underneath—that’s why the rug’s there!”

“How did they get in and out?”

“Well, Mr. Linnell—as to that—they got out with the night-watchman’s keys—we can’t find them anywhere—how they got in is a matter of conjecture—that’s what I want to see this other watchman, Druce, about.”

“But I presume you’ve formed some conclusions? There must be some——”

“There’s very little,” replied Goodall. “Very little indeed. No forced entrance at all. Not even a foot mark or finger-print. Three articles stolen—a night-watchman dead on the floor. Motive—burglary! Which makes the murder a subordinate factor in the crime. Which makes the murdered man almost impersonal! And I’m supposed to put my hands on this murderer in less than twenty-four hours—and that out of a little matter of six millions of people.”