[The sound again.
Listen!
[The sound a little louder.
What part of the floor?
[The clock begins to strike twelve.
Carter. Under the mattress—here!
Gordon. Go to the door and listen for him.
[Carter goes to door and bends down, listening. Gordon pushes aside the mattress and begins to claw the bricks with his fingers.
Carter. All's quiet. He does not always come. Here, your hands are bleeding.
[He begins to help with the bricks. They get one up, then some dirt, then another brick.