In the early 1920s, photographer Nellie Burns leaves Chicago to find adventure and a career in the West. She lands in Ketchum, Idaho. Out one night photographing moonshadows on snow, she discovers and photographs a dead body. When the body disappears and her negatives are stolen, she joins the chase to solve the mystery and find her negatives. But the Basque sheriff does not welcome her help, and the Chinese residents in town suspect Nellie herself of murder. As Nellie unravels the mystery of the missing body, she encounters a tangled web of revenge, opium addiction, obsessive love and loss, and a haunting story of devotion.