Balogh, Mary. Ravenswood novel #5

Winifred Cunningham, the adopted daughter of a portrait painter, forms a close friendship with Owen Ware and anticipates a possible marriage proposal from him. When she is introduced to Owen's older brother, Nicholas Ware, a cavalry colonel and the second son of the late Earl of Stratton, tensions arise between Winifred and Nicholas due to their contrasting personalities. Over the course of a summer spent at Ravenswood, repeated encounters lead them to reassess their initial impressions of one another