Syd recommends The Cold Vanish: Seeking the Missing in North America's Wildlands by Jon Billman

This book explores the lives of people who vanish in the wilderness and the struggle of those who look for them. The author tags along with a renowned surfer from Santa Cruz who upended his life to search for his son who disappeared in Olympic National Park in 2017, documenting the unique struggles and red tape that come with such a "cold vanish." Cases of people missing in Colorado are also explored, giving us a much better idea of how widespread the issue of missing persons are within our own communities. This book has it all: true crime, cryptozoology, cults, and often more questions than answers. So if you're a lover of the outdoors or mystery in general, this will be a compelling read!
Publisher's description:
Jon Billman's fascinating, in-depth look at people who vanish in the wilderness without a trace and those eccentric, determined characters who try to find them.