Before the action of the play begins, the following events are assumed to have taken place.
Mirabell, a young man-about-town, apparently not a man of great wealth, has had an affair with Mrs. Fainall, the widowed daughter of Lady Wishfort. To protect her from scandal in the event of pregnancy, he has helped engineer her marriage to Mr. Fainall, a man whom he feels to be of sufficiently good reputation to constitute a respectable match, but not a man of such virtue that tricking him would be unfair. Fainall, for his part, married the young widow because he coveted her fortune to support his amour with Mrs. Marwood. In time, the liaison between Mirabell and Mrs. Fainall ended (although this is not explicitly stated), and Mirabell found himself in love with Millamant, the niece and ward of Lady Wish-fort, and the cousin of his former mistress.
There are, however, financial complications. Half of Millamant's fortune was under her own control, but the other half, 6,000 pounds, was controlled by Lady Wishfort, to be turned over to Millamant if she married a suitor approved by her aunt. Unfortunately, Mirabell had earlier offended Lady Wishfort; she had misinterpreted his flattery as love.
Mirabell, therefore, has contrived an elaborate scheme. He has arranged for a pretended uncle (his valet, Waitwell) to woo and win Lady Wishfort. Then Mirabell intends to reveal the actual status of the successful wooer and obtain her consent to his marriage to Millamant by rescuing her from this misalliance. Waitwell was to marry Foible, Lady Wishfort's maid, before the masquerade so that he might not decide to hold Lady Wishfort to her contract; Mirabell is too much a man of his time to trust anyone in matters of money or love. Millamant is aware of the plot, probably through Foible.
When the play opens, Mirabell is impatiently waiting to hear that Waitwell is married to Foible. During Mirabell's card game with Fainall, it