For several years, we have had the letters exchanged by the resistance fighter and theologian Dietrich Bonhoeffer with his fiancée Maria von Wedemeyer, who is eighteen years his junior, during his imprisonment. The unusual engagement period, which only begins in prison, ends with Bonhoeffer's execution on Hitler's personal orders on April 9, 1945. The letters reveal how, despite physical separation, censorship of letters, and differences in age and background, a love of transformative intensity developed. One of the great testimonies from the German resistance.