I read this novel about 10 or 15 years ago, but it might be a bit older than that. Not very old, though, not much more than 20 years old, I think. I'm pretty sure I read it in English. I don't think it was a translation from some other language.
It takes place in our world, in our time period but djinn exist, hidden somewhere in mountains in the Middle East. Some guy is trying to use their power for his own purposes.
I don't remember much of it, and totally forgot the end, but I think it did not work the way this guy expected.