As a park ranger, Andrea Lankford led search and rescue missions in some of the most beautiful (and dangerous) landscapes across America, from Yosemite to the Grand Canyon. But though she had the support of the agency, Andrea grew frustrated with the service's bureaucratic idiosyncrasies, and left the force after 12 years. 2 decades later, however, she stumbles across a mystery that pulls her right back where she left off: three young men have vanished from the Pacific Crest Trail, the 2,650-mile trek made famous by Cheryl Strayed's Wild, and no one has been able to find them. It’s bugging the hell out of her. Beautifully written, heartfelt, and at times harrowing, this paints a vivid picture of hiker culture and its complicated relationship with the ever-expanding online realm, all while exploring the power and limits of determination, generosity, and hope.