Siren Phillips has lived her life thinking she__APOS__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__APOS__s his own father who is after Siren. When Siren__APOS__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.