Just Riding Destiny: A Regency Romance by Jean Luntz

Destiny may be the fastest three-year-old in Southern England, but will she be fast enough to save Kit Carlyle from a marriage of convenience to infamous rake Alistair Upshire? The viscount has loaned Kit’s father a considerable amount of money, a debt he will forgive if Kit consents to wed. She is attracted, instead, to Earl of Roxboro’s younger son, who has been sent to spy on Upshire, accused by horse breeding nobles of cheating at the races. Spectral Tillie, an Aberdeen Terrier, arrives to prevent the loathsome match, but unless Destiny wins, all might be lost.