As a sailor aboard The Delphis, Cassius discovers that being mortal is far different from what he'd ever imagined. He sails the seas, learns to fight, and meets a mysterious captain. But no matter how far he sails, the ghosts of his past haunt him as he battles monsters and conquers storms. Alongside the crew of The Delphis, and with gods and mortals trying to stop him, Cassius must uncover the secrets of magic and the destiny of the world.