 When bored courtesan Zelie de Chaumet begs her lover, the corrupt and powerful Stetz, to take her slumming, the pair encounter Pierre Boucheron, alias  The Rat  , boy-king of the Paris underworld, and the innocent Odile. Love, life and jewels are risked and lost in this powerful romantic melodrama as the four characters  lives are changed by this chance encounter for ever.