In the episode (Season 6, Episode 7), Dexter travels to Nebraska after learning that the family of Arthur Mitchell (the Trinity Killer) was murdered, with Arthur supposedly being the culprit. Knowing he already killed Arthur, Dexter suspects Arthur's son, Jonah , is responsible and goes to investigate. Key Plot Points

On his road trip, Dexter is accompanied by the "ghost" of his brother, Brian Moser (the Ice Truck Killer), who acts as a chaotic substitute for Harry's guidance and encourages Dexter to abandon his "Code".

Back in Miami, Debra struggles with the pressures of her new Lieutenant role while Masuka and his intern find a lead in the Doomsday Killer (DDK) case.

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