The life and significance of Dietrich Bonhoeffer's older brother, Klaus Bonhoeffer. Who was Klaus Bonhoeffer? While the life and work of Dietrich Bonhoeffer have been meticulously researched, there has yet to be a single monograph about his brother. Klaus was not only the elder sibling, but he also paved the way for Dietrich in many respects—most notably in the path toward resistance against Hitler. True to his personality, Klaus was, in some ways, even more resolute than Dietrich in the fight against the dictatorship. This book tells the story of Klaus Bonhoeffer and paints a new picture of his journey and significance. Jutta Koslowski evaluates previously unpublished sources and extensive archival material, including documents that had only been known within the Bonhoeffer family. Detailed interviews with the three surviving children of Klaus Bonhoeffer complement the work. It presents the life portrait of an unusual and previously overlooked figure from the Dietrich Bonhoeffer family and an exciting piece of contemporary history. The rediscovery of a strong personality from the Dietrich Bonhoeffer family. The life story of Klaus Bonhoeffer, as it has never been told before, featuring accounts from eyewitnesses and based on previously unpublished sources.