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- Season 4 overviewSep 19, 2011-May 7, 201223 episodesSeason 4 episodes1. Rise Sep 19, 2011
- Detective Beckett struggles to survive; Castle tries to identify the shooter.
- 2. Heroes & Villains Sep 26, 2011
- Castle and Beckett suspect a costume-clad vigilante is responsible for the murder of an ex-con.
- 3. Head Case Oct 3, 2011
- Castle and Beckett investigate a crime scene that involves a large pool of blood but no victim.
- 4. Kick the Ballistics Oct 10, 2011
- A young woman is shot to death with a gun a serial killer stole from Detective Ryan.
- 5. Eye of the Beholder Oct 17, 2011
- A sexy insurance investigator helps out when a valuable sculpture is stolen and someone is murdered.
- 6. Demons Oct 24, 2011
- Castle and Beckett investigate the murder of a ghost hunter who was looking into a haunting.
- 7. Cops & Robbers Oct 31, 2011
- Beckett tries to help when Martha and Castle are held hostage by bank robbers.
- 8. Heartbreak Hotel Nov 7, 2011
- When a casino owner is murdered at a warehouse, suspects emerge in New York and Atlantic City.
- 9. Kill Shot Nov 21, 2011
- The team searches for a sniper who is terrorizing New York; Beckett tries to hide her condition.
- 10. Cuffed Dec 5, 2011
- Beckett and Castle wake up handcuffed together in bed in a locked room.
- 11. Till Death Do Us Part Jan 9, 2012
- When Castle and Beckett investigate a man's death, a twist in the case may disrupt Ryan's wedding.
- 12. Dial M for Mayor Jan 16, 2012
- When a woman is found dead, the investigation leads to Mayor Robert Weldon, one of Castle's friends.
- 13. An Embarrassment of Bitches Jan 23, 2012
- The investigation into the death of a famous dog trainer leads to a reality-TV star.
- 14. The Blue Butterfly Feb 6, 2012
- Castle and Beckett investigate a mysterious case from 1947 in order to solve a present-day murder.
- 15. Pandora Feb 13, 2012
- Castle and Beckett find that the killer they are pursuing is part of an international conspiracy.
- 16. Linchpin Feb 20, 2012
- Beckett and Castle must stop a series of events that could result in a war.
- 17. Once Upon a Crime Feb 27, 2012
- Castle and Beckett pursue a killer who dresses his victims as fairytale characters.
- 18. A Dance With Death Mar 19, 2012
- Castle and Beckett investigate the death of a contestant on a popular dance competition show.
- 19. 47 Seconds Mar 26, 2012
- Beckett and Castle investigate when a bomb kills five people at a protest rally.
- 20. The Limey Apr 2, 2012
- A detective from Scotland Yard teams up with Castle and Beckett on a murder investigation.
- 21. Headhunters Apr 16, 2012
- Castle takes on Detective Ethan Slaughter (Adam Baldwin) as his partner.
- 22. Undead Again Apr 30, 2012
- When a body with human bite marks is discovered, a witness claims a zombie was responsible.
- 23. Always May 7, 2012
- Castle must protect Beckett as she pursues the man who shot her; feelings and secrets are revealed.