Anna Schmidt, a shell-shocked anthropologist, searches cross-country for the origin of an elusive folk tale in the wilds of the former United States. She holds her own secrets as the daughter of the premier cryptologist of the era, on the run by her deceased stepfather’s urging. She finds tantalizing hints of the tale, threats to her life, and unlikely connections — and a threat against humanity that only she, with her knowledge of cryptology, can solve.