The conversation was agreeably interrupted by a loud knock at the door.

At the same moment there was a loud knock on the door.

A loud knock came to the wooden entrance gate near the kitchen.

Suddenly breaking on their ears came a loud knock at the door.

Before Virginia could reply there came a loud knock at the door.

At that instant there came a loud knock at the front door.

Finally, there came a single, loud knock on the outer office door.

She was cut off by a loud knock at her front door.

Anything but a loud knock; anything but the confident summons of a friend.

A loud knock at the door punctured the stereo thrum of the phone.

A loud knock at the door broke in upon her musings.

In that very instant, a loud knock sounded on the door.

Finn was working on his statistics when the loud knock shattered his concentration.

At that instant there came a loud knock at the door.

Footsteps crossed the landing, and there was a loud knock on his door.

A loud knock, a quick step on the stairs, and Randal Leslie entered.