They had already seen to it that their automatics were handy, and now Nick produced a bunch of skeleton keys and began fitting them, one after another.
The fifth one worked. They stepped into the hall as if they belonged there—taking care to make no noise, however—and gently closed the doors behind them.
The adventure was well under way, and, technically speaking, they were already housebreakers.
CHAPTER XXXI.
“HOW ARE THE MIGHTY FALLEN!”
The house in which Nick and Chick found themselves had been a good one, but it was now badly in need of repair.
The main hall was comparatively wide for so narrow a building, and a heavy balustrade fenced off the stairs on one side.
The detectives paused just inside the door and listened intently. The doors on the first floor were all closed and the rooms behind them appeared to be untenanted. At any rate, all was still on that floor. Subdued noises of various sorts floated down to them from above, however, seemingly from the third floor.
They looked at each other significantly. Evidently, their theory had been correct—to some extent, at least.
They approached each of the doors in turn, but could hear nothing. Under the stairway they found the expected door leading down to the basement, but, as it was locked, and there was no key, they paid no further attention to it.
Instead, they started to mount the front stairs to the second floor. The stairway was old and rather creaky, but the detectives knew how to step in order to make the least noise. Consequently, they gained the next landing without being discovered.