The stakes have never been higher.
Whichever road they take one thing is certain - in the Underworld, evil is inescapable..
Meanwhile, Hazel and the crew of the Argo II have a choice: to stop a war or save their friends.
And, if by some miracle they do make it to the Doors of Death, there's a legion of bloodthirsty monsters waiting for them.
Wandering the deadly realm of Tartarus, every step leads them further into danger.
Literally.
If Percy Jackson and Annabeth fail in their quest, there'll be hell on Earth.
The stakes have never been higher