Gemma's life is slowly being destroyed. Cursed as a siren, she is struggling to escape a destiny of savagery and darkness. She's desperate to break the spell that has turned her into a monster and torn her away from the family - and boy - that she loves. But the alluring yet lethal sirens. Penn, Thea and the newly initiated Liv, have no intention of letting her go.
The key to her freedom lies in an ancient scroll. Gemma's quest leads her to someone who might be able to help - the mysterious and immortal Diana, who cursed Penn and her sisters thousands of years ago. But Diana will not give up her secrets easily, and unless Gemma and her sister Harper can unlock the scroll's powers then Penn will destroy the two sisters - and everyone they care about - for good.