In the Buenos Aires art world, a master forger has achieved legendary status. Rumored to be a woman, she specializes in canvases by the painter Mariette Lydis, a portraitist of Argentinean high society. But who is this absurdly gifted creator of counterfeits? What motivates her? And what is her link to the community of artists who congregate, night after night, in a strange establishment called the Hotel Melancólico?