Then, moving swiftly, he walked the length of the corridor, and, halting at her door, knocked once.
After a moment the door swung open.

He stepped forward into the room, closing the door behind him, and confronted the tall girl standing there silhouetted against the lamp behind her.
"You are insane to do this!" she whispered.

"I let you in for fear you'd knock again!" "I went to the bay-window," he said.
"You went too late.

I was there an hour ago.

I waited.