Catherine hummed lightly.
Anna picked up the letter, her confusion resurfacing, "But there's something strange about this letter, it's not like the usual cipher sequences... Why are there only ten letters? I... Oh! I understand now..."
Mason and Catherine were both clueless.
Anna hurriedly explained, "It's a different encryption method, one that I just mentioned in passing to Mr. Montaigne... It's not merely ten letters, but one to ten. We also need a book. Did Mr. Montaigne mention which book?"
Mason quickly answered, "He said to look for A and B."
"It must be a book that both he and I have, at least something that's not hard to find. B? What is that?" Anna's gaze swept over the shrine, and in an instant, she understood all the nuances.
With a smile, she pointed to the holy emblem, "It's a scripture."
After borrowing the "folio" from Revodan Cathedral, the contents of the letter were quickly decrypted.