If I Had a Hammer (Dexter)

"If I Had a Hammer" is the sixth episode of the fourth season of the American crime drama television series Dexter. It is the 42nd overall episode of the series and was written by producer Lauren Gussis, and was directed by Romeo Tirone. It originally aired on Showtime on November 1, 2009.

Set in Miami, the series centers on Dexter Morgan, a forensic technician specializing in bloodstain pattern analysis for the fictional Miami Metro Police Department, who leads a secret parallel life as a vigilante serial killer, hunting down murderers who have not been adequately punished by the justice system due to corruption or legal technicalities. In the episode, Dexter gets close to the Trinity Killer in an attempt to uncover his past, while Debra desperately wants to get involved in Lundy's case.

According to Nielsen Media Research, the episode was seen by an estimated 1.88 million household viewers and gained a 0.9/2 ratings share among adults aged 18–49, making it the most watched episode of the series by then. The episode received very positive reviews from critics, who praised Dexter's scenes with Arthur.