Gilda Sheen is a teenager whose body is changing — she is growing gills. After being identified from her record winning swims on the high school swim team, Gilda is hunted by the CIA to become a secret weapon. It’s the last thing Gilda wants to be, a weapon at all — much less so to an orange president. The ocean is the obvious place to hide but terrifyingly full of mysteries and monstrosities. An alternate plan presents itself when Gilda Sheen goes on a fateful field trip to the largest private aquarium in the United States, The Aquariums at Anemone, only two hours from her home town. The Aquariums at Anemone is set inside the vast estate of Joseph Q. Youmans, Anemone. Youmans allows private tours of his personal aquariums to select groups and schoolchildren like Gilda Sheen. After their fateful meeting, Gilda develops a correspondence with the powerful Mr. Youmans and seeks his assistance when she feels she must hide. Will Gilda be safe at Anemone or has the gilled girl been caught on the hook of yet another dangerous man?