By Act 5, Lady Wishfort has found out the plot, and Fainall has had Waitwell arrested. Mrs. Fainall tells Foible that her previous affair with Mirabell is now public knowledge. Lady Wishfort appears with Mrs. Marwood, whom she thanks for unveiling the plot. Fainall then appears and uses the information of Mrs. Fainall's previous affair with Mirabell and Millamant's contract to marry him to blackmail Lady Wishfort, telling that she should never marry and that she is to transfer her fortune to him. Lady Wishfort offers Mirabell her consent to the marriage if he can save her fortune and honour. Mirabell calls on Waitwell who brings a contract from the time before the marriage of the Fainalls in which Mrs. Fainall gives all her property to Mirabell. This neutralises the blackmail attempts, after which Mirabell restores Mrs. Fainall's property to her possession and then is free to marry Millamant with the full £6000 inheritance.