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Dexter follows Dexter Morgan, a forensic blood-spatter analyst for the Miami Metro Police Department who secretly lives a double life as a serial killer. Trained by his adoptive father Harry to channel his violent urges, Dexter follows a strict “code”: he only kills murderers and criminals who have escaped justice. Across the series, Dexter struggles to balance his hidden identity with relationships, family life, and increasingly dangerous investigations that bring him close to being exposed. Each season typically introduces a new major antagonist while exploring themes of morality, identity, and whether Dexter is capable of genuine human connection. The show mixes crime drama, psychological thriller, and dark humor, and is based loosely on the novels by Jeff Lindsay.