Sicily. August 11, 1676. Sister Maria Crocifissa della Concezione wakes early at her home at the Monastery of Palma di Montechiaro, covered in ink. Before her, a letter scrawled in a strange archaic alphabet. The work, the nun claimed, of the devil himself.
Her sisters in the convent agreed, believing the strange texts must be the work of the devil, and part of an elaborate scheme to turn her away from God. But, despite many attempts by codebreakers and scholars over the past three centuries, no one could read the letter.