bolt

Noirtier then took the trouble to close and bolt the antechamber door, then that of the bedchamber, and then extended his hand to Villefort, who had followed all his motions with surprise which he could not conceal.

There is no bolt-hole for you in this country.

At last however about two in the morning, I suddenly heard the gentle sound of a bolt being pushed back and the creaking of a key.

Then from the pocket of his overcoat he drew a bulky object, and he busied himself in some task which ended with a loud, sharp click, as if a spring or bolt had fallen into its place.