"Find out," was the answer. "Get back to hall quick. Brander may have looked in to help Mrs. A. with her night work while you were gone. Will hold enough men for an extra."

Simpkins called a cab and started for police headquarters at breakneck speed, but on the way he stopped at Brander's rooms; for a miserable suspicion was growing in his brain. "If that really was Isis," he was thinking, "it's funny she didn't nail me before I got to the door, even with the start I had."

On his representation that he had called on a matter of life and death, the janitor admitted him to Brander's rooms. They were empty, and the bed had not been slept in.

[!-- H2 anchor --]

IX

t was just after three o'clock when Simpkins, an officer on either side, entered the Oriental Building again, and hurried up the stairs to the Society's office.

There they were halted, for Simpkins had left his key sticking in the spring lock inside and slammed the door behind him, a piece of carelessness over which the officers were greatly exercised; for he had not confided to them that he had started off in a hurry. In the end, they sent the door crashing in with their shoulders and preceded Simpkins—and he was scrupulously polite about this—into the ante-chamber.