Dead Mountain: The Untold True Story of the Dyatlov Pass Incident - Donnie Eichar
So depending on when you catch me this book is a 2.5 or a 3. Eichar's conclusion about what killed the Dyatlov hikers seems sound, but there are parts of this book that are just, quite frankly, filler. Furthermore, Eichar renders himself unlikable in a couple places, in particular when commenting about the only survivor of the group. This man survived because he was unable to continue the hike. He does not return to the place with Eichar, who doesn't seem to understand returning to where your friends died might not be something you wanted to do as opposed to simply not being strong enough. Also it seems likely that a Russian might have been on the path of the same conclusion Eichar reaches, but simply lacked the funding and connections.

Still, the descriptions of the hikers as well as the analysis seems pretty sound and the writing is pretty good, even gripping at times.