After 4 books, it's still not clear if Kim seeks the Sultan's treasure or the sensation of being a genie. She says she isn't after the treasure, but she sure acts like it. But I think that's the book's lack of ability to convey a clear message, rather than an exciting mystery about the plot. Then again, the plot of Djinn has never been strong. In the end it's just a comic with beautiful (and very much naked) women and men in exotic settings.