The sensation was like being turned loose in the strong-room of a national treasury with nobody watching if you should choose to help yourself.

There are acres of floor in that building.

We walked twice the whole circuit of the upper and lower corridors, knocking on dozens of doors but getting no answer and finally brought up in the entrance hall.
Then it occurred to me that Grim might have gone into the building by some private entrance, perhaps round on the eastern side, so we set out to look for one.
We had just reached the northwest angle of the building, when Narayan Singh, who was walking a pace in front, stopped suddenly and held up both hands for silence.

Whoever he could see among the shadows must have heard us, but it was no rare thing for officers to come roistering down those front steps and along the drive hours after midnight, and our sudden silence was more likely to give alarm than the noise had been.

I began talking again in a normal voice, saying anything at all, peering about into the shadows meanwhile.