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- Season 6 overviewSep 23, 2013-May 12, 201423 episodesSeason 6 episodes1. Valkyrie Sep 23, 2013
- Beckett and Castle face the consequences of their decisions during a high-stakes investigation.
- 2. Dreamworld Sep 30, 2013
- Beckett races to find a stolen toxin capable of killing thousands of people.
- 3. Need to Know Oct 7, 2013
- Agents Beckett and McCord arrive to take over an investigation, creating tension in the precinct.
- 4. Number One Fan Oct 14, 2013
- A desperate murder suspect with a hostage insists on negotiating with Castle.
- 5. Time Will Tell Oct 21, 2013
- A murder suspect claims he has traveled back in time to prevent terrible events from unfolding.
- 6. Get a Clue Oct 28, 2013
- Castle and Beckett investigate the ritualistic murder of a young woman.
- 7. Like Father, Like Daughter Nov 4, 2013
- Alexis asks Castle for help proving a man's innocence 72 hours before his execution.
- 8. A Murder Is Forever Nov 11, 2013
- A well-known relationship therapist -- who knows secrets about her powerful clients -- is murdered.
- 9. Disciple Nov 18, 2013
- A woman who looks like Lanie is murdered; the team thinks the 12th precinct is being targeted.
- 10. The Good, the Bad & the Baby Nov 25, 2013
- When dying man leaves a baby with a priest, Castle and Beckett watch over the child.
- 11. Under Fire Jan 6, 2014
- Castle and Beckett suspect a serial arsonist of murder; Jenny goes into labor.
- 12. Deep Cover Jan 13, 2014
- The murder of a video store clerk with a secret history leads the team to Castle's father.
- 13. Limelight Jan 20, 2014
- When a pop star is found dead in an alley, Beckett and Castle look into her hard-partying lifestyle.
- 14. Dressed to Kill Feb 3, 2014
- Castle and Beckett dive into the world of high fashion to investigate a magazine employee's death.
- 15. Smells Like Teen Spirit Feb 15, 2014
- Castle and Beckett investigate the case of a teen who appears to have been killed with telekinesis.
- 16. Room 147 Feb 24, 2014
- A guilt-ridden woman confesses to a murder, but contradictory evidence complicates the case.
- 17. In the Belly of the Beast Mar 3, 2014
- Beckett assists with a narcotics investigation; a routine undercover operation goes awry.
- 18. The Way of the Ninja Mar 17, 2014
- Castle and Beckett investigate the mysterious murder of a Japanese ballet dancer.
- 19. The Greater Good Mar 24, 2014
- An investigation into the murder of a Wall Street trader takes a shocking turn.
- 20. That '70s Show Apr 21, 2014
- Castle and Beckett must play into a witness's delusions in order to solve a decades-old murder.
- 21. Law & Boarder Apr 28, 2014
- A mysterious motorcyclist shoots an up-and-coming professional skateboarder.
- 22. Veritas May 5, 2014
- Beckett becomes a suspect when a man she had been surveilling is killed.
- 23. For Better or Worse May 12, 2014
- When a surprise threatens to spoil Castle and Beckett's wedding day, they set out on a wild mission.