The Abyss Surrounds Us by Emily Skrutskie

For Cassandra Leung, bossing around sea monsters is just the family business. She’s been a Reckoner trainer-in-training ever since she could walk, raising the 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 solo mission and snatches her from the bloodstained decks, Cas’s dream of being a full-time trainer seems dead in the water. There’s no time to mourn. Waiting for her on the pirate ship is an unhatched Reckoner… Read more.