"Gemma and Hallie's world has come to a screeching halt. After their revenge agendas culminated in a fight at Hallie's birthday party, they're reeling with the news that their parents are engaged--which'll eventually make them stepsisters. Nothing in the world could possibly be worse for Gemma and Hallie, and they won't let it happen. Even if it means putting their own feud aside to separate their parents"--Dust jacket.
