In 1418 the crazed Duke of Milan had his wife Beatrice Lascaris di Tenda executed and the first deck of Tarot cards commissioned as a gift for his mistress Agnese Del Maino. Michellino di Besozzo painter of the cards and lover of Beatrice evoked a terrible blood magic in the cards that would reach across the centuries. In 2012 environmental activist Catherine Hanrahan discovers a secret that will rock the Vatican and ultimately everything she thought she believed in.