Complete story — includes the ending
Dexter has always known his father's Code was meant to protect him from exposure. But after committing a serious mistake, he wonders if it could have been designed to protect him from something even more dangerous: human emotion. When he discovers that Arthur is planning an out-of-town trip, Dexter sees an opportunity to ride along and gain insight into the mind of a fellow monster. Even so, Dexter isn't prepared for the startling revelations Arthur makes along the way, revelations about his own past which only serve to convince Dexter of what he must do. Meanwhile, back at Miami Metro, Debra refuses to let a technicality keep her off the Trinity case. She works through others to ensure her voice is heard - that is, until she realizes that her single-minded pursuit of the Trinity Killer may have blinded her to the truth.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Dexter season 4. HTML formatting and reference markers removed. · Content license