Proceeding noiselessly to the door, he halted and listened.
Voices, pitched in a low key, reached him.
It was impossible to distinguish the spoken words, although Patsy strained his ears in the attempt.
He was anxious to overhear something which would make it absolutely sure that he was on the right trail.
Stooping, he tried the old-fashioned trick of looking through the keyhole, but found that a hat had been hung from the knob inside, effectually covering the small aperture.
Raising himself erect, Patsy made a quick survey to left and right.
Instinctively, he came to the conclusion that the door to the right of the one before which he was standing was more promising than the one on the left.
He went to the door and tried it, but found it locked.
A skeleton key admitted him with very little trouble, and he found himself in an empty room.
A door led from this room into the one which Yasmar had entered, but it was closed and probably fastened.