My Mortal Enemy Willa Cather - My Mortal Enemy is a poignant character study of an extraordinary woman of commanding personality named Myra who gives up a fortune to marry for love. But was it the right choice?This book shows how although love can exist between a couple, resentment and regret can still arise and this can threaten to ruin a marriage. Can Myra and Oswald's love stand the test or may this end in the death of the relationship or an even worse kind of death?