After leaving her husband in a psychiatric hospital, a woman returns to Madrid by train. In the carriage, a stranger suddenly asks her if she would like to hear his life story. He turns out to be a psychiatrist who works at the same clinic and studies personality disorders through the stories and writings of the patients.  He keeps these texts in the briefcase he carries. When the psychiatrist gets off the train for a moment at a station and it goes without him, the woman has the bag full of texts in her hands, which we, irresistably, want to read with her. A novel which unleashes, in the manner of Cervantes, stories of unending inventiveness, in a circular structure which is masterfully resolved. The narrative itself questions the credibility pact with the reader, the limits of madness and sanity, the supplanting of identity, and the distinction between reality and imagination.