Knights Templar Mystery

Jack Hunter was a new Time Lord and his first mission was to take the Time Voyager, his space/time machine, into the past and visit the Temple Mound in 1150 AD Jerusalem when the Knights Templars occupied King Solomon Temple site and search for the missing Holy Grail. Was the Holy Grail a chalice or could it be the bones of Mary Magdalene, the wife of Jesus who had two children. Jack had to ensure the preservation of these holy bones by the Knight Templars. The Templars had to be warned of the October 13, 1307 death warrant date so the Holy Grail would be safe from the armies of the King of France.