Author and publisher Byron Preiss created an elaborate nationwide puzzle in 1982, by publishing 'The Secret: A Treasure Hunt,' a book containing twelve cryptic poems and twelve intricate paintings. Each pairing of verse and image supposedly leads to a ceramic casque buried in a North American park, which could be exchanged for a precious gem. However, Preiss was the only person who knew the precise location of every casque, and he took this vital information to his grave after a fatal car accident in 2005. With only three of the twelve treasures ever recovered, the remaining nine casques lie hidden in unknown locations, their forty-year-old clues potentially rendered obsolete by urban development, leaving a community of searchers to decipher the riddles of a man who can no longer provide any answers.