It's fall in the Sierra Mountains, and Anna Pigeon is slinging hash in Yosemite National Park's historic Ahwahnee Hotel. Four young seasonal park employees have disappeared, and crack search-and-rescue teams failed to turn up a single clue. Working undercover, Anna is detailed to dining-room duty; after a week of waiting tables, she knows the missing employees are only the first indications of a sickness threatening the park.
