""The Mysteries of the Knights Templar"" is a book written by Frank C. Higgins that explores the history and secrets of the Knights Templar, a medieval Christian military order. The book delves into the origins of the order, its rise to power, and its eventual downfall. It also examines the various myths and legends associated with the Knights Templar, including their alleged involvement in the Holy Grail and the Ark of the Covenant. Higgins uses...