The Ship of Love — Barbara Cartland

The daughter of a wealthy, ambitios man, Rowena knew that her father longed to marry her to a title, preferably the Duke of Wenfield, whom she disliked and did not wish to marry herself. To avoid marriage, they hatched a plot.

Posing as brother and sister, they would take a trip on a yacht with their like-minded friends and would help each other find the love of their dreams. Plans went awry on the Mediterranean, when Rowna was kidnapped by a Sultan, and was imprisoned in his harem. It seemed that they would be parted forever.