He raised the heavy door and looked in; the entrance was nearly choked up with ashes.

He removed some of the rubbish with his foot, and peered eagerly into the black darkness. The hole had a mysterious look about it, and he could not but regard it with strong suspicion.

One of the tenants of the house approached, pointed to the black opening, mysteriously shrugged his shoulders, shook his head, and then mumbled, in what he meant to be a confidential tone:

"That there underground passage leads clear across the back-yard, Mister Detective; and just let me tell you it'll be a mighty interesting thoroughfare for you to inspect."

"Thoroughfare, eh?" questioned Old Spicer, thoughtfully.

"That's what I said, sir."

"Thank you for the hint, my friend; most likely I shall act upon it later." Then he closed the trap-door, and once more turned toward the bar-room.

This apartment was of comfortable dimensions, and was the principal room in the basement. It was furnished on the same scale of poverty as the rest, and the first glimpse into it would not have been very reassuring to the spectator. The bar resembled those that bloom in cheap groggeries.

There was an evident purpose on the part of the owner to keep the public from sharing the brilliancy of the interior, for a paper screen two and a half feet high and two feet wide stood at the end of the bar as a barrier to the glow of an oil lamp that shed its exclusive light through the gloomy apartment.

A dilapidated, small-sized looking-glass adorned the partition wall back of the bar. In the tool-room were a hatchet and a butcher's knife, besides a bunch of rusty keys.