In the Deep, there are certain rules set: 1. Never cross territories that aren't yours. 2. Never hunt food that isn't yours. 3. Never show mercy. 4. Never go to the shore. These rules were biologically embedded into the Deep folk to keep the past from repeating itself. Arya goes out of her way to break these rules to survive. In return, a creature of the Deep follows her to shore and will do anything to accomplish its mission: to drag her to the Deep. With the help of new friends, Arya and her human, Mack, will discover what's truly hidden in the dark depths of the ocean. And what it truly means to fall for someone from a different world.