Basilio, an unlucky pickpocket, enters a mental institution to recover a valuable diamond necklace that passed through his hands and whose value he was unable to recognize. Once inside the asylum, he will try to use all the skills of his trade to overcome the obstacles that prevent him from reaching his goal: the impatient and illegitimate ambition of scientists like Hipólito, the attacks of altruistic bullfighters like Rufino, Paca’s socio-therapeutic agreements, or the unquenchable desire of a photophobic lover. In the end, the only way out for Basilio will be to submit to ‘Torapia’, an innovative experimental therapy that connects man with the beast in all of us.