The sirens are back, but Vanessa may be the biggest threat of all . . . Nothing has been normal since Vanessa Sands learned that her sister was murdered by sirens - femme fatales of the watery depths - and that everything she believed about herself and her family was a lie. Vanessa has always told her boyfriend Simon everything. But she worries that if he finds out who - or what - she truly is, he'll run a mile. To make things worse, when Parker, Hawthorne Prep's resident charmer, shows an interest in her, she can't resist the siren's urge to stray. And on top of all this, she's trying to be strong for her parents as they come to terms with her sister's death. But personal problems must be put aside, because the Winter Harbor sirens are back for revenge. Now Vanessa must face her past and accept that she is just like her enemies - every bit as alluring and every bit as dangerous.