Book excerpt: We pay them to protect us. And we're their biggest fans. They are our celebrities, and we worship them with paparazzi and endless gossip and speculation. To us, they are glamour. To them, we're an assignment. Their job is to guard us-that is, those of us who can afford them . . . Because the only thing stronger than a Guardian Angel is the rule they must obey. So what happens when one of them falls for one of us? In the City Angels, the rules are about to be broken.