For Cassandra Leung, controlling sea monsters is the family business. She's been a Reckoner trainer-in-training since she could walk, raising genetically-engineered beasts to defend ships as they cross the pirate-infested NeoPacific. But when the pirate queen Santa Elena swoops in on Cas's first mission and snatches her from the bloodstained decks, Cas's dream of being a trainer seems dead in the water. Waiting for her on the pirate ship is an unhatched Reckoner. Santa Elena wants a monster of her own, and she needs a proper trainer. If Cas fails, her blood will be next to paint the sea.