From the Land of the Moon

At the end of WWII a woman engages in a marriage of convenience to a man who had been kind to her family during the war. Constantly sickly, she goes to a spa to recover and falls in love with a veteran she meets there. Once parted she debates over the years whether or not to build a family with the man who loves her or try and re-kindle the lost bond with a man she loved whilst briefly away from home. Read more on Wikipedia.