He used to spy for us against the Turks and sell them information about us at the same time.
Nearly got shot for it, but was let off because his services had really been valuable.

I remember his being sent down to Jaffa and told to stay put." "But what in thunder are you going to do with him ?" I asked.

"He thinks you're Ali Higg" Grim chuckled.
"Wonder what Ali Higg will say when he's confronted by Ali Higg!" "Wonder what he'll do, you mean, don't you!" "What d'you keep looking back for ?" "Just keeping tabs on Ayisha." "No need to worry about her.

Now we've got Yussuf on our string it's a cinch we can use her whichever way the cat jumps.

She'll be afraid he'll tell tales about her." "Hell!" I said.