Is Trinity on to Dexter? In this clip, he asks his former friend and current nemesis just what he actually wants.
Added:
Angel interrogates Christine in this clip from "Hello, Dexter Morgan." What does she know about the Lundy killing?
Added:

Dexter Season 4 Episode 11 Quotes

If I can make the police think the Trinity Killer is someone else, Arthur is all mine.

Dexter

What kind of man witnesses a child abduction and doesn't call the police? Who are you, Kyle?

Arthur