O Meu Inimigo Mortal by Willa Cather

The story unfolds through the eyes of a young narrator, Nellie Birdseye, who recounts the life of Myra Henshawe, a woman who defied her wealthy family to marry for love. As the years pass, Myra's once passionate marriage becomes strained by financial difficulties and disillusionment. The narrative explores themes of sacrifice, the complexities of love, and the harsh realities of life, as Myra grapples with the consequences of her choices and the haunting realization of her own mortality.