Dr. Jonathan Ransom, a surgeon for Doctors Without Borders, is climbing in the Swiss Alps with his wife, Emma, when she falls into a hidden crevasse and dies. Twenty-four hours later, Jonathan receives an envelope addressed to his wife containing two baggage-claim tickets. Puzzled, he journeys to a railway station only to find himself inexplicably attacked by the Swiss police. Suddenly forced on the run, Jonathan's only chance at survival lies in uncovering the devastating truth behind his wife's secret life.