One thing that Grim did was to take gum and paper and contrive an envelope that looked in the dark sufficiently like the alleged Feisul letter; and he carried that in his hand as he took to the street, with Narayan Singh following among the shadows within hail.

Jeremy and I kept Narayan Singh in sight, for it was possible that Yussuf Dakmar had gathered a gang to waylay whoever might emerge from the house.
But he seemed to have had enough of bungling accomplices that night.
Grim hadn't gone fifty paces, keeping well in the middle of the road, when a solitary shadow began stalking him, and doing it so cautiously that though he had to cross the circles of street lamplight now and then neither Jeremy nor I could have identified him afterward.
Narayan Singh had orders not to do anything but guard Grim against assault, for Grim judged it wise to leave Yussuf Dakmar at large than to precipitate a climax by arresting him.

He had the names of most of the local conspirators, and if the leader were seized too soon the equally dangerous rank and file might scatter and escape.
Down inside the Jaffa Gate, in a dark alley beside the Grand Hotel, there are usually two or three cabs standing at any hour of the night ready to care for belated Christian gentlemen who have looked on the wine when it was any colour that it chanced to be.

There were three there, and Grim took the first one, flourishing his envelope carelessly under the corner lamp.
Yussuf Dakmar took the next in line, and ordered the driver to follow Grim.

So we naturally took the last one, all three of us crowding on to the rear seat in order to watch the cabs in front.