Dietrich Bonhoeffer (1906-1945) remains the most seminal theologian of those whose work was forged and tested in the worst years of the twentieth century. A German who loved his country and culture, and who mourned its crimes and actively resisted them, his ethic was wholly contextual, attuned to what he must do in his own land as a disciple of Jesus Christ. He might have been surprised to find that a half-century and more later his work has been...