House by the sea, paperback/santa montefiore

Ten-year-old Floriana is captivated by the beauty of the magnificent Tuscan villa just outside her small village, and dreams of living there some day.

When Dante, the son of the villas owner, invites her inside, she knows that her destiny is there, with him.

But as they grow up they cross an unseen line, jeopardizing the very thing they hold most dear.