The Mystery of the Holy Grail [Outdoor]

Some say the Grail is hidden somewhere in London..... but nothing has ever been found... Now an old diary has been discovered, with cryptic clues that could finally expose the truth.. and this is where you come in!...Combine your skills to crack the clues and unravel the epic tale..Discover London's amazing history and secret hidden gems. Share an epic adventure and find real hidden treasure at the end! + two historic taverns en route!