Read it through once

The door closed, and Carton was left alone. Straining his powers of listening to the utmost, he listened for any sound that might denote suspicion or alarm. There was none. Keys turned, doors clashed, footsteps passed along distant passages: no cry was raised, or hurry made, that seemed unusual. Breathing more freely in a little while, he sat down at the table, and listened again until the clock struck Two.