This was the fourth time.

And Cassidy would be tremendously upset! Praying that Peter would remain quiet, Jolly Roger took off his shoes.
After that he made no more sound than a ferret as he crept to the door.
An inch at a time he raised himself, until he was standing up, with his ear half an inch from the crack that ran lengthwise of the frame.
Holding his breath, he listened.

For an interminable time, it seemed to him, there was no sound from within.

He guessed what Cassidy was doing--peering through that slit of window under the curtain.

But he was not absolutely sure.