The author proposes a geometric solution to the mystery of the Rennes-le-Chateau valley. Combining elements of ancient geometry and mythology, he attempts to define a web of sacred "unseen" ciphers joining elements of Egyptian mythology (particularly the cult of Isis), old testament standards (Noah{u2019}s Ark, Eve{u2019}s sin, and the Temple of Solomon), along with [holy] Grail lore and Arthurian legend. He also alludes to the hidden sacred and secret--the Knights Templar in particular. The underlying theories presented here form the basis for much of the Da Vinci code/Grail mythology of recent years.