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. Not a sound of any sort came to his ears. He stepped inside
courageously and slipped with his back to the wall, where he waited,
holding his breath.

Click! It seemed to come from his right.

"Come out o' that!" he snarled. "No monkey-business, or I'll shoot."

He flashed his pocket-lamp toward the sound, and aimed.

A blow on the side of the head sent the detective crashing against a
cartonnage, and together the quick and the dead rolled to the floor.
Instinctively Haggerty turned on his back, aimed at the window and
fired.

Too late!