The Bargain Bride

This is a love story set in early 19th cent. London - very much in the style of the great Georgette Heyer. After spurning his attempt to make her his mistress our heroine is tricked into marriage by the Marquis of Beverley. She does so to save her twin brother from fighting a duel with Beverley who is an accomplished shot. Beverley is ruthless in pursuit of his own ends and it is only when he almost loses his wife that the marquis becomes a more admirable character.