Great romantic suspense story in the vein of Mary Stewart.
The young heroine lies to her parents so she can go to Santorini to get to know her natural father. He's a famous archaeologist, but a cold and rotten father. While she's there her father uses her to do some archaeological diving for treasure.
Toss in a young hero, a suspense mystery/adventure that dates back to the WWII, and the reader has fast paced enjoyable story.