Once again the tap sounded, a little more peremptorily this time.

Kermal was about to speak when a light tap sounded at the door.

A tap at the door sounded loud in the quiet.

As they were sitting down, a light tap sounded at the door, and Ruth entered.

The taps given by Georges had sounded the full distance.

A tap sounded from the direction of the open door.

Again the taps sounded; they seemed nearer to the corner of the room.

A tap sounded at his door, more mouse scratching than a real knock.

A tap on the door sounded above the wind.

Again seven taps sounded and Mosgorovsky moved across to the secret door.