The sexual abuse of children by paedophile priests in the Catholic church has been the subject of several documentaries, but Alex Gibney proves his mastery of documentary by returning to the issue and making a compelling and moving narrative from it. From the first interviews with the victims of a predator priest, through to the desperate efforts of the Vatican to hide the extent and the history of the problem, Gibney holds our attention and engages our compassion and our anger. Former Cardinal and Pope, Joseph Ratzinger, features prominently as the person in charge of the cover-up. It seems only fitting that he should have retired shortly after this documentary was released. I hope many people see it and give some thought to the religious practices which led to these crimes. Fundamental changes are required, not just apologies.