With Penn and Lexi determined to kill Gemma and replace her with another siren, Gemma's life is in grave danger...unless she can break the curse before it's too late. With the help of Harper and Daniel, she'll delve deep into her enemies' mythical past--and their darkest secrets. It's her only hope of saving everything she holds dear: her family, her life, and her relationship with Alex--the only guy she's ever loved.