Pastor, theologian, Nazi-resister, assassin, martyr. For the depth and daring displayed in these roles and others, the legacy and popularity of Dietrich Bonhoeffer has only grown in the decades after his death. But the intellectual seedbed of his doctoral dissertation Sanctorum Communio remains surprisingly unearthed. To be fair, there is good reason: it is arguably the most perplexing of Bonhoeffer’s writings. In Christ Existing as Community, Michael Mawson serves Bonhoeffer scholars and enthusiasts alike by rendering this opaque work more clear. What is more, Mawson provides a valuable resource for the community to which Lord Bonhoeffer dedicated his life.