Sea Swept
The final book in the Sisters Ever After series of fairy tale retellings from the point of view of the siblings in the background, this is the captivating of story Daria and her older sister, Meria, who has left their life under the sea for a human prince. But when Meria needs Daria's help, she must travel to the human world to save her older sister. Daria grew up in Serema, an underwater city where merfolk and humans livetogether in peace. She's not interested in life out of the water, unlike her oldersister, Meria, who has fallen in love with a human prince. Still, when Daria gets a distress message from Meria, she's willing totrade her mermaid tail for legs if it means getting her sister back below thesurface as fast as possible. Except Meria has vanished, and none of thehumans will tell Daria where she is. In the strange world above the sea, Daria will soon discover that shecan't trust anyone--and that whatever happened to her sister might happen toher next.
