An Inside Job (Gabriel Allon #25) - Daniel Silva

Gabriel Allon has been awarded a commission to restore one of the most important paintings in Venice. But when he discovers the body of a mysterious woman floating in the waters of the Venetian Lagoon, he finds himself in a desperate race to recover a lost masterpiece by Leonardo da Vinci. The painting, a portrait of a beautiful young girl, has been gathering dust in a storeroom at the Vatican Museums for more than a century, misattributed and hidden beneath a worthless picture by an unknown art