Adam Long is a research assistant specializing in marine life who is about to have his notions of science flipped upside down. When a member of the EPA wakes him in the middle of the night to tell him to ready a tank at the research facility for a previously unknown species, he's excited and a little nervous at being left in charge of such a large task. He never expected that species to be a merman. This predatory being named Oron is nothing like the mermaids of his childhood, and the creature's dangerous adaptations are enough to make anyone want to keep their distance. Left in charge of the project while his boss is dealing with the bureaucrats, Adam doesn't realize that a fateful slip will leave him at the mercy of the creature that everyone has cause to fear, and give him a few adaptations of his own that will turn his merman into the man of his dreams and change his life forever.