We heard Yussuf Dakmar stop his cab two hundred yards away.  The cabman turned his horses and drove back toward Jerusalem without calling on Allah to witness that his fare should have been twice what he received; he didn’t even lash the horses savagely; so we supposed that he hadn’t been paid, and went on to deduce from that that Yussuf Dakmar had driven away again, after satisfying himself that the Feisul letter had reached headquarters.  It was lazy, bad reasoning—­the sort of superficial, smart stuff that has cost the lives of thousands of good men times out of number—­four o’clock o’ the morning intelligence that, like the courage of that hour, needs priming by the foreman, or the sergeant-major, or the bosun as the case may be.

The sentry turned out the guard, who let us through the gate after a word with Narayan Singh; and the man who leaned on his bayonet under the portico at the end of the drive admitted us without any argument at all.

I suppose he thought that having come that far we must be people in authority.  Ever since then I have believed all the stories told me about spies who walked where they chose unchallenged during wartime; for we three—­a Sikh enlisted man, an Australian disguised as an Arab, and an American in civilian clothes—­entered unannounced and unwatched the building where every secret of the Near East was pigeonholed.

We walked about the corridors and up and downstairs for ten minutes, looking in vain for Grim.  Here and there a servant snored on a mat in a corner, and once a big dog came and sniffed at us without making any further comment.  Jeremy kicked one man awake, who, mistaking him for an Arab, cursed him in three languages, in the name of three separate gods, and promptly went to sleep again.  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.  But it was several seconds before I made out what the Sikh’s keener eyes had detected instantly, and Jeremy saw it before I did.