Savage Surrender (Harlequin Presents, 401)

From the back of the book: Her secret saved her from Alex's charms Sophie loved Crete. Working there as secretary to Madame Leftas was like a dream come true. It was far away from England and the secret, impossible love for Simon that she had to forget. When Alex, Madame's playboy son, began a campaign to add Sophie to his list of casual conquests, she was merely indifferent. No one could replace Simon anyway. Or so Sophie thought... until the night Alex found her in Simon's arms. Then began a campaign of a different sort-one Alex was determined to win