Nic Costa is a fictional character from the Nic Costa series of crime novels written by author Michael Connelly. He is a detective in the Rome Police Department, known for his keen investigative skills and deep understanding of human nature. The series often explores themes of justice, morality, and the complexities of crime in a historical and cultural context. The character of Nic Costa is often portrayed as a dedicated and passionate investigator, navigating the challenges of his profession while dealing with personal struggles. His interactions with various characters, including criminals and colleagues, highlight the intricacies of law enforcement in a vibrant city like Rome.