Darren Shan returns to the city ruled by a mob figure, the Cardinal. It takes place at the same time as his previous tale about the Cardinal’s invented, though quite real, people in Procession of the Dead (paper). Hell’s Horizon (trade from Grand Central Publishing) tells of Al Jerry, who is content to be one of the Cardinal’s guards until someone murders his lover and the Cardinal insists that he investigate the murder or be fired. Along the way he discovers his relationship to the famed assassin of the city, and the relationship of a group of Aztec priests to the Cardinal and the future of the city. I only hope the next book in the series tells us what happens after the Cardinal’s death.