The Queen of Hearts — Barbara Cartland

Handsome King Ivan of Arramia has no wish to lose his freedom, despite advice to marry, but he agreed to marry at last--and trade his notorious affaires d'amour for affairs of state. Princess Zelie has been badgering her father to find her a husband who was a king. As Zelie was due to leave for Arramia, the future bride developed measles, and her twin sister, Princess Sola of Kessell, took her place for the Official Visit, lest the reluctant monarch change his mind.

But when revolution flared in Arramia, nothing less than a Royal Wedding could save the King... For his sake, Sola must perform her charade to the end! Yet a true heart can make miracles: A marriage of deception was transformed into a rapturous alliance, a radiant Destiny of Love for all eternity.