"Unwritten Rules" is the first episode of the fourth season of Blue Bloods.


Shortly after Jamie is assigned a new partner, Edit "Eddie" Janko, they respond to a call where suspects are fleeing a jewelry store heist. While giving chase, one of the first officers on the scene is shot and later dies. Frank turns it into a mission for the NYPD to find the shooter.

The case ends up being assigned to Danny and Baez who have a witness to the crime. Unfortunately, the elderly woman is unable to identify the man they suspect of the crime, so Danny coaches her. Erin doesn't think the woman's testimony is good enough, especially with Danny's interference, so she lets their suspect go.

This causes backlash among both the family and the rank-and-file of the NYPD who promptly stage a "blue flu" in retaliation. Erin and Danny must work together to come up with another way to get their suspect.


Detailed recap of the episode that contains MAJOR SPOILERS.
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Cast & Characters

Guest Starring

  • Malcolm Goodwin as Angelo Reid
  • Sylvia Kauders as Mrs. Caruso
  • James Martinez as Officer Salazar
  • Kathleen McNenny as ER Doctor
  • Auden Thornton as Angie
  • Amy Morton as Amanda Harris


  • Josh Tower as Detective Donnelly
  • Ejyp Johnson as Trevor
  • Ryan Johnston as Joey
  • Amanda Holston as Officer Collins
  • Racine Russell as Uniform #1




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Season 4 Galleries


Notes & Trivia

  • The DVD contains deleted scenes for this episode.


Season 4 Episodes
"Unwritten Rules" "The City That Never Sleeps" "To Protect and Serve" "The Truth About Lying" "Lost and Found" "Growing Boys" "Drawing Dead" "Justice Served" "Bad Blood" "Mistaken Identity" "Ties That Bind" "The Bogeyman" "Unfinished Business" "Manhattan Queens" "Open Secrets" "Insult to Injury" "Knockout Game" "Righting Wrongs" "Secret Arrangements" "Custody Battle" "Above and Beyond" "Exiles"
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