Read it through once

“They were very cunning, though. They must have thought that there was some chance of their being followed, for they would never go out alone, and never after nightfall. During two weeks I drove behind them every day, and never once saw them separate. Drebber himself was drunk half the time, but Stangerson was not to be caught napping. I watched them late and early, but never saw the ghost of a chance; but I was not discouraged, for something told me that the hour had almost come. My only fear was that this thing in my chest might burst a little too soon and leave my work undone.