In the foreground, a black cat. Pale green sky are the very last words that Vincent van Gogh wrote down before his suicide. In a letter to his brother, he described the recently completed painting "Le Jardin de Daubigny." This unique masterpiece was meant to remain one of a kind, but a Parisian painter who purchased it made a copy that is still considered a genuine work of the master today. How could a forgery deceive the art world for over a century? How did the painting come into circulation? Why do art experts not see through the deception? Hanspeter Born and Benoit Landais embark on a quest for answers and expose the forger.