Deciphering the Zodiacal Code

William successfully deciphers the secret message left by Venantius. The message, written in a zodiacal alphabet, reads: 'Secretum finis Africae manus supra idolum primum et septimum de quatuor.' This is a clue to entering the 'finis Africae,' the most secret part of the library. The Greek notes on the same page contain fragments of text that seem to describe a book about comedy and the power of laughter.