Officers Ferrando and Guglielmo discuss with the lebenserfahrenen Don Alfonso on the loyalty of women. The two young men are the steadfastness of their two fiance, the sisters Fiordiligi and Dorabella, sure; Don Alfonso, however, has a different opinion and completes a bet: he wants to prove that the loyalty of women holds no 24 hours: a necessary departure of lovers is played before the two young women. Beyond recognition, disguised, the two officers as "Strangers" resurface and be welcomed by Don Alfonso as old friends. The ladies away for the time being indignantly. Then, claim the "foreigner" to drink poison out of spurned love and play in a death scene. In the women's compassion awakens, and so it doesn't take long until they, after the two by the maid Despina, disguised as a doctor "are been healed", to divide the two newcomers among themselves. You have changed the original partners, without even knowing it. Alfonso and Despina bring together the replacement pairs. Guglielmo and Ferrando then decide to punish women. Don Alfonso but advises to deliberation: you should take the women as they were. He and Despina continue playing the comedy. A wedding table is set, the notary rushes forth (again, it is the disguised Despina), Ehekontrakte be closed quickly. But as Don Alfonso reports the return of former lovers. Excited to hide the new husbands. It appear the same as officers, in their initial adjustment. Alfonso lets you find the Ehekontrakte the ladies need to confess. Ferrando and Guglielmo fall out to kill the "competitors", but immediately return to the Panel. The hide and seek has come to an end. The officers pay their betting debt and decrease the "real" ladies in the arms. Ends well, everything good?