"As the mermaid Crown Princess of Thalassinia, Lily must dive deep into findng a solution when she discovers the ocean's warming is causing big waves for both mermaids and humans"--

Seventeen-year-old Lily, half-mermaid and half-human, has been living on land and attending high school, where she develops a crush on a boy but is afraid to tell him of her true destiny as the ruler of the undersea kingdom of Thalassinia.