Siren Song (Siren #1)

Sirina is your average twelve-year-old. She's got a little annoying brother, two busy parents and she lives a perfectly normal life. Until one day she's at the beach with her little brother when she discovers a misterious girl in the water. The girl is strange from the start. She can't speak, she is an excelent swimmer, and it seems that Sirina's mother knows about this girl. What's her mother hiding? Who's this girl and where did she come from? Is it possible that she could be one of the mythical sirens from the stories Sirina's mother told her? And is it possible that Sirina is also a siren?