In 1937, on the threshold of Nazi Germanys war on the world, n Dietrich Bonhoeffer wrote what turned out to be one of then n most influential books of the century, The Cost of Discipleship. In it, he challenged the flabby faith and compromises of Germann n Christians, famously writing, When Christ calls a man he bids him come and die. n n Now, seventy-three years after the book was first published, Jon Walker writes Costly Grace: A Contemporary View of Dietrich Bonhoeffers The Cost of Discipleship. Walker brings to a new generation the timeless message of Bonhoeffer against the background of todays political upheaval and societal change and what it means to those who claim to follow Christs teachings.n