Grand Theft Auto IV follows Niko Bellic, a war veteran from Eastern Europe who arrives in Liberty City seeking the American Dream. Drawn into a world of crime by his cousin Roman, Niko must navigate dangerous criminal organizations, corrupt officials, and moral dilemmas while searching for the person who betrayed his military unit. The game features an open-world Liberty City inspired by New York, with a focus on realism, physics-based driving, and a mature, cinematic story.