This is a book that will be of particular interest to those who have followed the ups and downs of the priest-worker movement in France and who have felt great concern about the apparent lack of religion among French workingmen. It is the diary of a theologian and sociologist who worked in the French mines from July 1951 to February 1952, a priest incognito. The entries represent ""a mixture of events, situations, personal thoughts and reactions"". The author aims to offset statistical analyses anent the loss of religion among French workers with a qualitative analysis that looks below the surface. Behind and within anti-Christian sentiments and actions he frequently discovers evidence of true religion at work. Objection is not to the Gospel but to formalization, he finds. A very interesting, informative and provocative volume.