"Dexter" revolves around Dexter Morgan, a Miami-based blood spatter analyst for the police department who leads a secret life as a vigilante serial killer. Dexter follows a strict moral code instilled in him by his late adoptive father, targeting only those who have escaped justice for their crimes. The series delves into Dexter's struggle to balance his dual life, dealing with relationships, his identity as a killer, and the constant threat of exposure. "Dexter" examines the nature of justice and whether a person can compartmentalize good and evil.