The Return of the Soldier - Rebecca WEST

In 1916 on an isolated country estate just outside London, Captain Chris Baldry, a shell-shocked captain suffering from amnesia, makes a bittersweet homecoming to the three women who have helped shape his life. Will the devoted wife he can no longer recollect, the favorite cousin he remembers only as a childhood friend, and the poor innkeeper's daughter he once courted leave Chris to languish in a safe, dreamy past--or will they help him recover his memory so that he can return to the front? The answer is revealed through a heart-wrenching, unexpected sacrifice. (Summary from Wikipedia).