Violeta Graceland travels to the gothic estate of Lakesedge to protect her brother, Arien, who possesses a volatile and dark magic. There she encounters Rowan Goldwin, a young man rumored to be a monster, who is bound by a blood tithe to a dark god known as the Lord Under. As Violeta uncovers the secrets of the estate’s corrupted waters, she must decide how much she is willing to sacrifice to save those she loves from the shadows.