Dexter is now a married family man, and Rita has given birth to a baby boy named Harrison. The family has moved to the suburbs, where Dexter struggles to reconcile his new life as a family man with his killing urges. Special Agent Frank Lundy returns, having recently retired from the FBI, and is hunting the “Trinity Killer” (John Lithgow) who he believes always murders three people in a very specific sequence: a young woman in a bathtub, an older mother of two falling to her death, and a father of two bludgeoned to death. Lundy also states that Trinity’s pattern has been repeated in various cities across the country dating back over decades. The character of Christine Hill (Courtney Ford) is introduced, a journalist who begins a relationship with Detective Quinn.
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