讲述一家人搬进了一栋古老的维多利亚风格的房子。他们在阁楼发现一个装着古董的柜子，而这些古董都被一个邪恶的灵魂附着。当越多家庭成员接触这些古董，邪灵就变得越强大，最终邪灵终于开始向孩子伸出了魔爪……

Siren Phillips has lived her life thinking she's an ordinary girl, in an ordinary town. On the eve of her twelfth birthday, however, she learns that she is far from ordinary. Destined to turn into a Mermaid at the age of twelve, Siren must struggle with her new reality, saying good-bye to her mother and friends, while she transitions into the water. To make matters worse, a group of hunters are trying to catch her. She soon becomes friends with Adam Wilts, a new boy at school, who she turns to for help. He agrees to help her, but finds himself caught in the middle, when it's his own father who is after Siren. When Siren's mother is taken, the town must rally behind her, and help her make a peaceful transition into the water, before the hunters can find out where she is.