Tidal Forces

Human scientists have long tried to discover the truth about the merfolk, and they'll use any trick in the book to accomplish their goals. When a mermaid goes off to find the human she fell for, her sister, Adrianna, is given the task of retrieving her before the scientists can cause her harm or learn too much about her kind. Those on the surface have never faced anyone like Adrianna, an elite member of the Tidal Forces.