As the Winter's Solstice journey to Trilleah is canceled, Bella, the Twins, and the other Travelers plan to visit Matt's lake house instead. However, Kaija Mae's unexpected arrival brings urgent news of the King's plot to destroy Trilleah. The Shailmas swiftly transport the Travelers back to a crumbling Trilleah, where some souls are irredeemable. Deadly Blood Covenants and shocking revelations await as they confront the hidden sea and the fate of the last tablets.