Fins

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.

"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"--