A Confusion of Princes — Garth Nix

You'd think being a Prince in a vast intergalactic empire would be about as good as it gets. Particularly when Princes are faster, smarter, and stronger than normal humans. Not to mention being mostly immortal.

But it isn't as great as it sounds. Princes need to be hard to kill -- as Khemri learns the minute he becomes one -- for they are always in danger. Their greatest threat? Other Princes. Every Prince wants to become Emperor, and the surest way to do so is to kill, dishonor, or sideline any potential competitor. There are rules, but as Khemri discovers, rules can be bent and even broken.

Soon Khemri is drawn into the hidden workings of the Empire and dispatched on a secret mission. In the ruins of space battle he meets a young woman called Raine, who challenges his view of the Empire, of Princes, and of himself.

But Khemri is a Prince, and even if he wanted to leave the Empire behind, there are forces that have very definite plans for his future. . . .