With fiery, wise words and a passion for justice, Reverend Martin Luther King, Jr. influenced one of the most powerful movements of the twentieth century and inspired hearts everywhere. Here is the definitive selection of 11 of his most affecting sermons, from his earliest known audio recording to his last sermon, delivered days before his assassination. With introductions by renowned theologians and ministers, including the Reverend Billy Graham and Archbishop Desmond Tutu, and filled with moving personal reflections, "A Knock At Midnight" is Dr. King's living voice -- a resounding call that will continue to resonate and inspire.The definitive selection of 11 previously unpublished sermons by the most beloved preacher and civil rights leader of our time, Dr. Martin Luther King, Jr.