Chill Factor (Weather Warden Book 3) by Rachel Caine
Joanne, now a human, and her djinn lover David go to Las Vegas NV to stop the irritating adolescent boy from the last book from wreaking havoc upon the world with the most powerful djinn of all time whom he has managed to “claim.” It quickly becomes apparent that this powerful djinn Jonathan has his own frightening agenda.
Joanne and David still have to dodge the Wardens. Unexpectedly, a sinister anti-Warden group known as the Maat arises to further hinder them. Joanne has several funny, yet suspenseful, exchanges with these ruthless, disapproving old geezers. A fun read.