Scales - A Lunar Chronicles Retelling of The Little Mermaid

Scales just wants to be normal. But the only normal she knows is gills in her neck, flippers on her feet, and webs between her fingers. She is the daughter of the most famous Earthen marine biologist-- which means a whole lifetime spent under the sea. In an effort to make her more comfortable aboard his submarine, he had her body genetically modified, enabling her to breath and swim inhumanly fast underwater.
Yep, she's a human fish, and not happy about it. Her oddities scare away the other scientists she lives with, and she is forbidden to peek even a hair above water. But after spotting the handsome Prince Erickson aboard the Rampion, she is determined to find a way to meet him-- even if that means losing her Voice.