Styx has risen from her river with an army of the worst immortals and monsters following her orders.
Saffron is trapped on Ogygia with a newly resurrected enemy, oblivious to the details of the prophecy surrounding her and her heart. Lamb heals from her wounds as enemies ride for her and the other huntresses, searching for the one destined to take down the worst monster of them all- Typhon. Hermes grieves the actions of his mistakes, while building an army with Hades and Persephone in Poseidon's castle. And Hart Sommers, the first oracle in two thousand years, must find the other components of the prophecy before Styx. Let the war begin.