Alive: The True Story of the Andes Survivors by Piers Paul Read
1972. A plane has crashed in the Andes mountains. The passengers are hopelessly lost in one of the most isolated places on earth.
Almost three months later, two of the survivors, emaciated and frozen, reach the authorities and lead a rescue team to the remaining fourteen passengers.
The rescue team are shocked when they reach the crash-site. Food supplies have long gone, and the remains of the dead lie scattered among the fuselage.
It is only too clear how these passengers have managed to stay alive ...