Readers examine eight codes and ciphers that could not be cracked. The ancient Phaistos Disc, circa 1700 BCE, the Voynich Manuscript with its strange illustrati

The greatest unsolved problems that are, or are thought to be, codes or ciphers.

New Yorker Tom Bohannon finds his life in danger after he uncovers an ancient scroll in a secret room in New York City's Bowery Mission and sets out to decode t