In postwar France, Reda Kateb plays Jan Bojarski, a Polish refugee who becomes the most brilliant counterfeiter of his era. For over a decade and a half, he produces nearly perfect banknotes in his backyard—so convincing that even the Banque de France cannot tell them apart from the originals. ​​

But the flood of counterfeit money brings Inspector Mattei (Bastien Bouillon) onto the scene, whose relentless pursuit of the unknown master counterfeiter leads to a nerve-wracking game of cat and mouse, in which Bojarski takes ever-greater risks—until his entire existence is on the line.