The Separation is a novel by British writer Christopher Priest, published in 2002. It is an alternate history revolving around the experiences of identical twin brothers during the Second World War, during which one becomes a pilot for the RAF, and the other, a conscientious objector, becomes an ambulance driver for the Red Cross. The author introduces a deliberate confusion by giving these brothers identical initials – J.L. Sawyer – one known as Jack (the pilot) and the other as Joe (the ambulance driver).