High Quality Content by WIKIPEDIA articles! The Getaway is the fourth season finale of the American television drama series Dexter, and the 48th overall episode of the series. It originally aired on Showtime on December 13, 2009. In the episode, Dexter goes to great lengths to stop Arthur, who now knows Dexter`s true identity. Meanwhile, Debra learns the truth about Dexter`s mother, the homicide division closes in on the Trinity Killer, and Rita reaffirms her support for Dexter, even as she acknowledges his hidden demons.