Though Georgette Heyer specialized in Regency romances, this one is Georgian, set in the 1770s. It's great fun. Horatia, the teenage heroine, talks a British earl twice her age into wedding her. It's what was known as a "marriage of convenience" -- a bargain in which the earl gets a wife and, presumably, an heir, and his bride's family gets a financial rescue. No love is involved on either side, but both husband and wife profess themselves to be well satisfied with the arrangement.