Dexter Morgan, is a young man who works for the Miami Police Department as a forensic blood spatter pattern analyst. In his spare time, Dexter is a serial killer with a catch: he only kills murderers he believes have escaped from judicial punishment.
Dexter also has an inner voice he refers to as the “Dark Passenger,” who keeps prodding Dexter to kill something. Once he has done so “properly,” the voice is satiated for a while and keeps silent until the urge to kill comes again.
Dexter manages his double life reasonably well for years, but is unprepared when a serial killer with an artistic and playful style that impresses Dexter starts terrorizing Miami's hookers. As the “Tamiami Slasher” rampages through the city, he begins sending messages to Dexter, who finds the series of terrifying crimes engrossing and fascinating. Meanwhile, his sister, Deborah, sees the series of murders as her ticket out of the Vice unit and into Homicide, and has asked Dexter to help her in her ambitions. Dexter is torn between helping his sister to catch the killer and a desire to sit back and admire the artistry and skill of a fellow killer's work.
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