The rake's daughter - Anne Gracie

Recently returned to England, Leo, the new Earl of Salcott, discovers he's been thrust into the role of guardian to an heiress, the daughter of a notorious rake. Even worse, his wealthy ward has brought her half-sister, the beautiful but penniless Isobel, with her. Leo must find Clarissa a suitable husband, whilst keeping the untameable Izzy under control. However, after the girls launch themselves into society with tremendous success Leo must enter society to protect Clarissa from fortune hunters, and try not to be driven mad by the sharp-witted, rebellious, and intoxicating Izzy.