The Story of Francis Cludde by Stanley J. Weyman

Tell him all? I stood thinking, my hand on the key. The voices of the rearmost of the conspirators sounded more and more faintly as they passed up the shaft, until their last accents died in the room above, and silence followed; a silence in strange contrast with the bright glare of the torches which burned round me and lit up the empty cellar as for a feast. I was wondering what he would say when I told him all -- when I said "I am your son! I, whom Providence has used to thwart your plans, whose life you sought, whom, without a thought of pity, you left to perish! I am your son!"

Infinitely I dreaded the moment when I should tell him this, and hear his answer; and I lingered with my hand on the key until an abrupt knocking on the other side of the door brought the blood to my face. Before I could turn the key the hasty summons was repeated, and grew to a frantic, hurried drumming on the boards -- a sound which plainly told of terror suddenly conceived and in an instant full-grown. A hoarse cry followed, coming dully to my ears through the thickness of the door, and the next moment the stout planks shook as a heavy weight fell against them.