Vicious Champion by Nikki Kardnov

I, Ana Hearthtender, nobody orphan of Mt. Olympus, survived the first round of Trials to become Champion of Hades House.

In fact, there are only two competitors left—me and the infuriating Haven Knightfall.
He’s my nemesis, my tormentor, and my sometimes partner. Except for the part where he betrayed me and took all the credit for himself. I can’t figure him out. It’s all the more confusing because my body remembers all to well the feel of his touch, the caress of his lips, the—
Nope. Not thinking about any of that.

Which would be easier if our next Trial didn’t require us to go on a long journey, just the two of us, working together on a mission to find the Fates. At least we’ll finally get some answers about what’s really going on.
If Haven I manage not to kill each other on the way there, that is.

But when it turns out there’s so much more at stake than I ever dreamed, both Haven and I will face a choice that will change everything.