Secret Fire by Johanna Lindsey

He’d caught only a glimpse of her from the window of his carriage, but the young prince knew he had to have her. Within minutes, Lady Katherine St. John was dragged from the London street and carried off to a sumptuous town house — for the pleasure of her royal admirer…

From the tempestuous passion of their first encounter, across stormy seas, to the golden splendor of palaces in Moscow, she was his prisoner — obsessed with rage toward her captor even as an all-consuming need made her his slave. Yet theirs was a fervor beyond her understanding, carrying them irrevocably toward final surrender to the power of undeniable love.