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.

Influenced by Brian, Dexter kills a motel clerk who stole his hunting knives. However, by the end of the episode, Dexter rejects Brian’s influence and runs him over with his car, signaling a return to Harry's Code.

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