Flashback is set in Florida’s Dry Tortungas National Park. This park is a group of tiny island off Key West. It is a remote area with few visitors, but much history. This book more or less tells two stories, present day and the Civil War period when the park served as a prison.
High Country is set out west in the Sierra Mountain’s Yosemite National Park where Anna goes undercover as a waitress to find out what is going on and why four young people who work at the park as seasonal employees have disappeared.