Miss Jacobson's Journey (1992)

"Improper and impious!" her family cried, but in a most unladylike fashion, Miriam Jacobson defied her parents. Finding the thought of marriage stupefying, she rejected the eminently suitable bridegroom they had selected. Instead, she chose adventure, traveling the Continent and assisting her physician uncle in his labors.

Following the good doctor's death and the outbreak of war, Miriam decides her time for adventure is over. To secure passage to England, she accepts a patriotic mission from the banking family, Rothschild, though it means enduring a lengthy journey through France and Spain in the company of two insufferable gentlemen--one an intolerant aristocrat and the second a member of her own faith who seems to harbor a grudge against her, and is somehow disturbingly familiar . . . [from the jacket]