Underworld

Everyone thinks entering a blackhole is suicide, but that's not what will kill you, it's what's on the other side.
Adrian
Oceania was nothing more than a cosmic garbage disposal, sucking up stars and chewing them apart. How could this possibly be the entrance to the Underworld? Prometheus is gone and I have no way to track her - Sydney. I said I would move heaven and earth for her and I meant it.
Hera
I sit here with my heart in my hands hoping against hope we can maneuver through this quagmire without dying. The Underworld is riddled with pitfalls the likes of which Pythia never fully explained.
Sydney
I never should have trusted Charon, being a Fate doesn't make you all-powerful, just stupid. I have two choices curl up and die waiting for Adrian to find me or do what I do best - Fight.
There is no way to leave the Underworld without crossing the plains of Judgment.
If you like Clash of the Titans, Dan Brown and the Expanse you will love Underworld.