"The del Cisne girls have never just been sisters; they're also rivals, Blanca as obedient and graceful as Roja is vicious and manipulative. They know that, because of a generations-old spell, their family is bound to a bevy of swans deep in the woods. They know that, one day, the swans will pull them into a dangerous game that will leave one of them a girl, and trap the other in the body of a swan. But when two local boys become drawn into the game,...