All her life, Sunny has known three things about the creatures that prowl the seas off her tiny coastal town. They are dangerous. They are violent. They are monsters. But when a chance encounter leads to an unexpected connection, Sunny discovers just how wrong she has been. The monster she meets - Mo - is intelligent, gentle, and searching for his lost brother. Sunny desperately wants to help, and to keep her new friend a secret. But other people are keeping secrets too. And as hunger grips the town, new truths will emerge about the real monsters in Seawaren.