Turning sixteen can be hell, especially if everyone in town thinks your mother killed herself and your sister. All Kira Callahan wants to do is swim, hang out with her best friend, Sean, and ignore the kids who torment her at school. That is, until one day when she gets invited to a party. For three minutes her life is wonderful—she even kisses Sean. Then somebody spikes her drink and some girls from out of town lure her into the ocean and hold her underwater. Kira soon discovers that the group of wild teenagers who have come to visit Crescent Moon Bay are not as innocent as they seem. In fact, nothing is as it seems—not the mysterious deaths of her sister and mother, not her heritage, not even her best friend. And everything seems to hinge on the ancient Celtic legends that her mother used to tell her as a child.