A year after saving the powers of Olympus by defeating Nyx, the Goddess of Darkness, Daphne is haunted by still-looming threats, her complicated feelings for the god Apollo, and the promise she made to the Olympian gods that she would help them again when they called upon her. When their command finally comes, it is deceptively simple: secure herself a spot as one of Queen Helen’s guards. A war is coming, and all of Sparta must be prepared. In the midst of a treaty summit among the monarchs of Greece, Daphne and Helen uncover a plot of betrayal—and soon, a battle begins that leads to all-out war.