Three at least by the time she told me to go behind the door.
He took them all and turned in time to see something move behind the door.
She had long been in her own room behind a closed door.
He found what had to be them behind the open main door.
The thing which had been standing behind the door and waiting for her wasn't human.
He stood up and put his back to the wall, behind the door.
But there was another sound growing behind the door, the like of which he'd never heard before.
I'm keeping very still behind the door, I can hear my own heart.
No matter what came up, I would stay behind the door of my office and deal with it there.
They weren't interested in what might be behind the door, not yet.