"The Templar Revelation" is a book by authors Lynn Picknett and Clive Prince that explores the historical and mystical aspects of the Knights Templar. It delves into the idea that the Templars possessed secret knowledge and artifacts, particularly related to Christianity and Gnosticism. The authors argue that this hidden wisdom has influenced various religious and cultural movements throughout history. The book also examines the connections between the Templars and other significant figures, such as Mary Magdalene and Jesus Christ. It suggests that the Templars may have been protectors of a sacred lineage and that their legacy continues to impact modern spirituality and conspiracy theories.