John learns that Seymour nearly set fire to the city, before fleeing to find Elizabeth. To defend the city, John is determined to raise an army, a bellicose desire that greatly displeases Sarah. In addition, memories come back to haunt the young woman.

To celebrate Sarah's return, John throws a big costume party. The gates of New Babylon finally open and the city is preparing to experience a memorable carnival night. For her part, Elizabeth secretly manages to blend in with the crowd, intending to purify the city of all its demons, first and foremost John and his relatives.