For nearly two centuries, the knights templar were the most fearsome and unstoppable crusader militia in the world. Then came accusations of unspeakable crimes resulting in their precipitous collapse. But who were the templars and how did they become so powerful so quickly? 'Decoding the past' draws on interviews with the world's leading biblical scholars and visits historic sites throughout Europe and the near east to probe the history of this shadowy order. Did they, as many believe, guard the Holy Grail or was the object of their attentions buried a thousand years before the birth of Christ? What became of their many treasures when their leaders were accused of high crimes and imprisoned of put to death? This incisive documentary reveals the many secrets to this mysterious order.