In the final episode of the season, Ashley and the team set out in search of one of the greatest and most famous relics of all time - The Holy Grail. As a Knight Templar Ashley has spent years researching the Grail, and this investigation is the culmination of his quest. He has uncovered a lost carving in Scotland - one that he believes could be a map to the location of the Holy Grail. The investigation leads the team to a place nobody has considered, and from there a series of clues takes Ashley to a startling conclusion. In the end, can Ashley fulfill his own destiny and complete his Grail quest? What will that journey reveal about the location of the Grail, its destiny, and Ashley himself?