Brooklyn Mermaid - C. E. Simpson

nIn this loose sequel to CYOA bestseller Journey Under the Sea, YOU are a mermaid living on the outskirts of the city of Atlantis with your family, who are part of the anarchist Merzood clan. You live in hiding from the Ruler of Atlantis, who wants to use your Merzood magic for evil. When he captures you and imprisons your family, he has a ransom demand for you: that you retrieve the Eye, a lost Atlantean relic, filled with an ancient magic that could make his reign of terror even worse.

With your family's freedom at stake, you don't have much of a choice, except for where to start looking: in Atlantis, or on land in Brooklyn? Will you be able to find the Eye, rescue your family, and stop the Atlantean Ruler from taking over the world?