Eugenia, a worldly Baroness, and her free-spirited artist brother, Felix, arrive in 19th-century Boston from Europe. Seeking a wealthy American husband after her own morganatic marriage falters, Eugenia and Felix immerse themselves in the lives of their staid New England relatives, the Wentworths. Their sophisticated, somewhat cynical European manners clash delightfully with American innocence and provincialism, leading to a charming comedy of errors, cultural contrasts, and unexpected romances.