The mystery of Cassio's assassins draws Ornella ever deeper into a world of danger and deception. Her assistant Yani is found murdered. The elderly Maria, housekeeper to the enigmatic Tanhauser, begs her trust, but withholds as much information as she gives. Meanwhile, in the Alexandria of antiquity, Cassio comes the closest yet to getting his revenge on Livion, but his plan threatens to fall through at the hands of the beautiful and tormented Antinoé, the most famous and influential prostitute in the city. What does she know about her master Marcion's plan to subvert the Roman Empire by means of religion?