"Dexter" is a crime drama about Dexter Morgan, a man who leads a double life as an incredibly likeable forensics expert for the Miami Police Department and as an emotionless vigilante serial killer. Taught by his foster father to harness his lust for blood and killing, Dexter lives by his own strict moral code - he only kills murderers who can't otherwise be brought to justice. Dexter is a killer who grapples with fitting into society while, at the same time, he struggles with his inability to feel emotion. The irony of Dexter's life is that he works closely as a blood splatter analyst with the very people who hunt his kind - the homicide department. Dexter's "Regular Joe" front is in full force while working alongside the ill-tempered Sgt. James Doakes, who seems to be the only one to sense Dexter's more sinister side, and Lt. Maria LaGuerta, the head of the division who pursues Dexter sexually with as much force as she would any criminal. While his sister, Debra Morgan, a tough and determined cop, leans on Dexter for personal advice and career advancement, the closest one Dexter "connects" with is Det. Angel Batista whose similar attention to detail and taste for forensics almost mirrors his own. While sentiment and feelings elude Dexter, he struggles to find a kindred spirit of sorts in his emotionally damaged girlfriend, Rita, who keeps him grounded in the realities of "normal" life and provides him respite from the dark corners of his mind. The series is based on the acclaimed novel, "Darkly Dreaming Dexter," by Jeff Lindsay. Includes all episodes of Seasons 1 through 4.