The "Nic Costa series" is a collection of crime novels written by author David Hewson. The series follows the character Nic Costa, a detective in Rome, as he investigates various murder cases while navigating the complexities of Italian culture and society. Set against the backdrop of the historic city, the series combines elements of mystery and thriller, offering readers a glimpse into both the criminal underworld and the beauty of Rome. The books are known for their rich descriptions and intricate plots, making them popular among fans of detective fiction.