Corrie ten Boom and her family hid Jewish refugees in Nazi-occupied Holland until they were betrayed and sent to the concentration camps. Her sister Betsie died in Ravensbruck. Corrie survived. What she carried out of that experience, a faith so tested and refined that it had become something beyond argument, is one of the most remarkable testimonies in modern Christian literature. Her declaration that there is no pit so deep that God is not deeper still is not a platitude. It was earned in the darkest place imaginable. For any reader living through their own unsurvivable season, Corrie ten Boom has already been there and brought back a light.