He is the author of The Ringbearer's Diary. Originally published in 1985, the book describes the supposed reality behind J.R.R. Tolkien's The Lord of the Rings and Richard Wagner's Der Ring des Nibelungen - a ring of self-reinforcing but destructive ideas that through ages has haunted humanity, causing untold pain and suffering. Peter Kjaerulff names this ring 'The Cursed Ring'.
By revealing this ring, Kjaerulff opens the door to a deep and thorough understanding of what a human being really is. Along the way, the Great Pyramid of Giza becomes understandable and logical - reincarnation becomes understandable - and the so-called chakras are described.