Imagine a heart which has been ripped from a man's body, wrapped with thorns, pierced with a knife, and then placed on the man's chest; or a group of people who believe that wearing a small rectangle of wool next to their skin ensures that they will go to heaven - as long as it is brown wool and worn continuously. Although psychoanalysts have long investigated similar ideas and beliefs, they have ignored popular Catholicism, even though behaviour such as this occurs over and over again in the history of Catholic cults and devotions.

Michael Carroll is the first to bring psychoanalytic theory to bear on a range of Catholic cults and devotions, including the Rosary, the Angelus, the Stations of the Cross, the Blood Miracles of Naples, the Stigmata, the Forty Hours, the Brown Scapular, and the Sacred Heart of Jesus.

Carroll assembles a great deal of historical information that until now has been widely scattered in obscure publications. He suggests why such devotions are absent from the Protestant tradition and argues for a new and more subtle appreciation of the role that Italian Catholicism played in shaping Catholicism generally.