Petronella's Waterloo (a Regency Romance‪)‬

Petronella Fanshawe, thwarted by Lord Claverton from becoming governess to his sister's children, obtains another post and is able to leave her aunt and jealous cousins. She does not wish to go with them to  Paris, now Napoleon is safely imprisoned on Elba, but her employer's  husband, a Frenchman, unexpectedly takes them there, where she finds  herself embroiled in intrigue, thrown into Lord Claverton's company. Regency Romance by Sally James; originally published by Robert Hale [UK]