Equipped with a burner phone and a new job, Cassie Peters has left her hectic and secretive life in New York City for the refuge of her hometown of Mammoth Lakes, California. There, she begins working again with Yosemite Search and Rescue, where a case she worked a decade ago continues to haunt her. She quickly falls into old patterns, joining a group of fellow seasonal workers and young adventurers who have made Yosemite their home during the summer....

A massive earthquake in the Yosemite National Park region leaves the icy ground unstable. K-9 handler Von Sharpe attempts to rescue Stella Rivers from a stranded SUV, but they are trapped in the unstable wilderness with a killer on the loose.

When rebellious seventeen-year-old Rilla is sent from West Virginia to stay with her park ranger sister in Yosemite National Park, she risks everything as her summer becomes one ecstatic, harrowing experience after another.

When Sadie Harlan visits her daughter, Lauren, at her summer internship in Yosemite National Park, it seems like the perfect way to forget about her empty nest and failing marriage back home. But when the two women get lost on what's meant to be a short hike, they suddenly find themselves fighting for their lives. As they search for food, water, and civilization, they battle injury, exhaustion, and natural predators. Sadie, however, is assaulted...