Angels of the flood - Joanna Hines

Florence 1966: the most beautiful city on earth was devastated by a terrible flood. No tourists, no cars, just a sea of oily mud. The young volunteers from overseas who came to rescue the buildings, paintings and sculptures, became known as the 'Angels of the Flood'. Kate Holland was one of these angels, until the hideous death of her friend Francesca forced her back to England with a vow never to return.
Now, for the first time in thirty years, Kate is drawn to Italy again. Someone has sent her a priceless Italian painting … but it has been crudely tampered with. What is the mysterious message at its heart? Her trail leads Kate back to Francesca's family home ... a family whose dark secrets are as abundant as their lavish works of art. And when she meets Francesca's younger sister again, Kate's life is suddenly in danger.