The Edge Of The Abyss by Emily Skrutskie

In this thrilling sequel, the protagonist, Cas Leung, finds herself navigating the treacherous waters of a world where sea monsters and pirates reign supreme. As tensions rise between humans and the formidable Reckoners, genetically engineered sea creatures, Cas must confront her past and make difficult choices to protect those she loves. With alliances shifting and danger lurking at every turn, she is forced to question her loyalties and redefine what it means to be a hero in a world teetering on the brink of chaos.

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