1977: a mentally ill patient is released from an asylum under order of Commissioner Flores to help him in a case: the kidnapping of a girl named Isabel Preaplana. But after the releasing, the commissioner doesn't give any help to our "detective". He's an uneducated, physically weak, crazy man, but he's able to manipulate people with his talk. In addition, Mercedes Negrer, a friend of Isabel, proposes to help him in the case.
