While reporting on a Velázquez exhibition at the Prado Museum, the misanthropic and mordant journalist Mariano Larro and the intrepid and seductive photographer Fran Kapa witness a series of inexplicable murders and become the sole suspects for the crimes. This anachronistic and irascible duo, together with four other characters – a jokey robotics student, a flamboyant Danish woman and fan of paintings featuring dwarves, a writer and inveterate romantic, and the opportunistic editor of the Sunday supplement ‘Everybody’s Happy’ – become involved in an action-packed investigation in which the search for the truth will lead them into the very bowels of the museum and its unfathomable mysteries.