He had no real cause to regret Mason's advent or his escape.
Yet, deep in his heart burned the chagrin of defeat: his man had got away, and half the game (if you're a true hunter) was in putting your hand on a man's shoulder and telling him to "Come along." He crossed the street and entered the, alley and gazed up at the fire-escape down which Mason had made his escape.

What impelled the detective to leap up and catch the lower bars of the ground-ladder he could not have told you.

He pulled himself up and climbed to the window.
Open! Haggerty had nerves like steel wires, but a slight shiver ran down his spine.

Open, and Crawford yet on the high seas.

He waited, listening intently.