She utters to Leonardo very pleasant promises indeed, if he will betray his friend.
Leonardo, a wavering baritono, complains that love should ask for any return save in the coin of the empire of love.

He is seduced, and invokes a malediction upon his head should he accomplish what he has sworn to perform.

Camilla reposes perfect confidence in this wretch, and brings her more doubtful husband to be of her mind.
Camillo and Camilla agree to wear the mask of a dissipated couple.
They throw their mansion open; dicing, betting, intriguing, revellings, maskings, commence.

Michiella is courted ardently by Camillo; Camilla trifles with Leonardo and with Count Orso alternately.

Jealous again of Camilla, Michiella warns and threatens Leonardo; but she becomes Camillo's dupe, partly from returning love, partly from desire for vengeance on her rival.