Fontis has sold over 180,000 copies of "Pardon, I am a Christian" since 1977. Wikipedia states: "The book is based on a series of radio addresses that Lewis, an outspoken critic of this medium, delivered in 1943 as a moral contribution to World War II for the BBC. In 1944, Lewis refused to continue the lecture series, stating that he had now... The transcripts of his lectures were initially published in three volumes titled 'The Case for Christianity,' 'Christian Behaviour,' and 'Beyond Personality.' It wasn't until 1952 that they were compiled under a new title. The audiobook is narrated by Philipp Schepmann, a freelance speaker and actor for radio, stage, and television.".