Mu church is reading a selection of his works this fall as a congregational project, and I'm curious to learn more about him than I can from the Wiki summary.
Even though countless biographies have been released since, Eberhard Bethge’s Dietrich Bonhoeffer: Theologian, Christian, Man for His Times: A Biography is still the most reliable work to go to if one wants to find about Bonhoeffer’s life in a historical context. There is just no other person who was as close to Bonhoeffer as his student Bethge especially for the time he went underground after Himmler closed the Finkenwalde seminary in 1937. Ferdinand Schlingensiepen, a close friend of the deceased Bethge, released a shorter biography with some new sources in 2005, which was translated as Dietrich Bonhoeffer, 1906–1945: Martyr, Thinker, Man of Resistance (2010). In there, you will also find pictures of Bonhoeffer’s illustrious family and friends. Bethge also edited Bonhoeffer’s collected works. Bonhoeffer was an exceptional pastor and theologian who came from an intellectual background and studied in Tubingen, Rome, Barcelona and New York. He saw much clearer than most people in the Confessing Church what is going on in Nazi Germany. Still, he stood in a specifically Lutheran Protestant tradition in which it was not suitable to oppose the state on any issue, let alone speak out for the Jews. This context is important to consider, and I do not think that a Christian publicist like Eric Metaxas has the necessary background to do so.