With a bound she sprang toward the curtained archway and, pushing it aside, peered sharply into the room.

It was empty.
"Did you hear some one cough, Arline ?" she asked anxiously.
"Yes," replied Arline, who had joined her.

"The sound came from in here, didn't it ?" "So I imagined," declared Grace in a puzzled tone.

"Perhaps it came from the hall.

No one could have escaped from here before I reached the door without my hearing them.