My Lord Winter (Unabridged‪)‬

Lady Jane Brooke sought shelter when her coach broke down, and found herself at the Earl of Wintringham’s estate. Trying to conceal her identity, she introduced herself as a governess. Lord Winter, as the apparently cold earl was called, thawed in response to the delightful Miss Brooke, but she knew he would never approve of her deception. 

Regency romance by Carola Dunn; originally published by Harlequin.