As a Cetean historian, Sven knows histories are subjective, yet he has believed he knew the truths of his people and their tenuous relationship with Earth... Until he returns to the planet with his wife and brother to complete a Hunt. Before he can find the amulet or a Guardian to help him, Leanne falls sick. Bryant—excellent doctor that he is—cannot save her. She is dying when she disappears into the blue. The Guardians of Earth's oceans are waiting for her, however, and they have the keys to all of Sven's riddles, but somehow create more questions for him. Now they don't know who to trust, but Sven won't stop searching until he gets to the bottom of this trench. Meanwhile, Bryant must come to terms with his own past to embrace a new future. Can his broken heart heal? Will he allow himself to love again?