A Canticle For Leibowitz (St. Leibowitz, #1)

First there was the Fallout, the plagues and the madness. Then began the bloodletting of the Simplification, when the people - those few who were left - turned against the rulers, the teachers and the scientists who had turned the world into a barren desert where great clouds of wrath had destroyed the forests and the fields. All knowledge was destroyed, all the learned killed - and only Leibowitz managed to save some of his…