This is such a unique story and very different from anything I've read before. Styx bounces between the POVs of Bastian and Zan. Bastian survived a car accident where his mother died and that he feels responsible for. He's floating through life without much direction. Zan is bound to the River Styx and must deliver souls that got stuck on the way to heaven or hell for a term of 500 years; he's on year 499 at the time of the story.

These two should have never crossed paths, but Bastian keeps appearing in Zan's realm because he was actually supposed to die in the accident, too. Bastian doesn't want to die. Zan wants his freedom but doesn't want Bastian to die, either. They form a relationship while trying to sort through these things and the fact that they do not exist in the same place. This leads to an interesting perspective on grief and moving on.

I really enjoyed the audiobook version of this book. It was recorded in a dual narrator format, so Zan and Bastian both get a voice. I loved getting a voice to pair with the characters I'd read about previously; I think it helped me to get a better idea of what they were supposed to be like (for example, one voice was lower than I had originally imagined). They both speak clearly, which allows you to speed it up if that's your jam.

Thanks to Dreamscape Media and NetGalley for an ALC of this audiobook for an honest review.