The Double-Dealer: A Comedy by William Congreve

Touchwood, about to marry Cynthia, daughter of Sir Paul Plyant. Lady Touchwood, a violent and dissolute woman, is in love with Mellefont, but as he rejects her advances, determines to prevent the match and ruin him in Lord Touchwood's esteem. In this design she finds a confederate in Maskwell, the Double Dealer, who has been her lover, pretends to be Mellefont's friend, and aspires to cheat him of Cynthia and get her for himself.