Finished He Said/She Said by Erin Kelly. I received a copy for review.
This is told from two perspectives and goes back and forth in time. Kit is an eclipse chaser and has been since childhood. His girlfriend Laura is a recent convert. One trip, they stumble across a rape. (Laura arrives during the attack; Kit only sees the aftermath.)
That is basically the most straightforward part of the book. For the rest, we keep learning new things; each revelation throws other things into doubt.
This book is an actual masterpiece. I have no idea how Erin Kelly manages to write books like these, how to have every new detail be a complete surprise but also make perfect sense.