Over the course of one ghastly week in September 1982, the bodies of four taxi drivers were found in Buenos Aires, each murder carried out with the same cold precision. The assailant: a 19-year-old, odd and taciturn, who gave the impression of being completely sane. But the crimes themselves were not. More than thirty years later, Argentine author Carlos Busqued began visiting Ricardo Melogno, the serial killer, in prison. Their conversations return to the nebulous era of the crimes and a story full of missing pieces. The result is a book at once hypnotic and unnerving.