 On a honeymoon camping trip, newlyweds David and Mimi Karney are seriously injured in a fall from a cliff. David has a broken hip and is unable to move. Mimi is ambulatory but is amnesiac and uncommunicative due to a head injury. Sergeant Walters finds her wandering on a nearby road and takes her to a first aid station. Dan Mathews  attempts to question her are unsuccessful, though he learns her identity from an inscription in her wedding ring. Dan organizes a search party when he deduces that Mimi s husband was with her in the rough terrain and that he is probably seriously injured. When the search party is unsuccessful, Dan takes the still-uncommunicative Mimi back to the campsite, hoping that she can provide a clue to the weakening David s whereabouts.