Ptolemys Gate - Jonathan Stroud, Random House Books

Three years on from the events in The Golem's Eye, the magicians' rule in London is teetering on a knife-edge, with strikes, riots and general unrest. The Prime Minister is largely controlled by two advisors, one of whom is 17-year-old Nathaniel. Meanwhile, living under a false identity, Kitty has been researching djinn, she has come to believe that the only way to destroy the magicians is for an alliance of some kind between djinn and ordinary people.