Evidence uncovered during research conducted in Florence’s Palazzo Vecchio late last year appears to support the theory that a lost Leonardo da Vinci painting existed on the east wall of the Hall of the 500, behind Giorgio Vasari’s mural “The Battle of Marciano.”

A real-life Da Vinci mystery, complete with tantalizing clues and sharp art sleuths, may soon be solved, as researchers resume the search for a lost Leonardo masterpiece believed to be hidden within a wall in a Florence palace.