https://www.amazon.com/dp/B072Y3W1V5/
MELODY, Dee, was the youngest child to fall under Letal's knife. It was her culling that finally goaded Kirin into the war. Even though her xylin node was left intact, Dee's wings never recovered and she cannot fly. But, Dee, has an extraordinary gift, never seen before in the species. She can control the sea and communicate with the little mermaids, the merikin. When one of the Houses conspires to destroy Kirin with poison, they experiment on the merikin with great loss of life. In a desperate attempt to save the merikin and the Heartland seas, Dee races against time and miles to lead her friends to safety.