That Sweet Enemy is a historical novel written by Katharine Tynan in 1901. The book is set in the late 18th century and follows the story of two young lovers, Mary and John, who are torn apart by the ongoing conflict between England and Ireland. Mary, a young Irish woman, falls in love with John, an Englishman, but their love is forbidden due to the political and social tensions between their two countries.As the story unfolds, Mary and John struggle...