10 Best Episodes of Castle

After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New York City to tag along with an NYPD homicide investigation team for research purposes.

Written by Sophie and last updated on feb 04, 2023.

PS: The following content contains spoilers!

PPS: I will admit that parts of this page was written with the help of AI - it makes my work so much easier to not start from a blank page!

Castle - S2E18

#15 - Boom! (2) (Season 2 - Episode 18)

In the second part of the story begun in "Tick, Tick, Tick," the serial killer remains at large and is taunting Castle, Beckett and Jordan Shaw to catch him

The episode was rated 8.40 from 788 votes.

Castle - S3E16

#14 - Setup (1) (Season 3 - Episode 16)


Castle and Beckett investigate the apparent robbery-homicide of a New York cab driver, only to discover that the victim was involved in a mysterious conspiracy with unimaginable consequences. As the stakes continue to rise, hard-charging federal agent Mark Fallon takes over the investigation. Together, Fallon, Beckett and Castle must race to unmask the truth about the victim before it's too late.

The episode was rated 8.40 from 776 votes.

Castle - S6E22

#13 - Veritas (Season 6 - Episode 22)

A secret investigation conducted by Beckett related to her mother's murder goes awry when a man she has been surveilling is killed. When evidence links Beckett to the victim, she and Castle become the targets of a manhunt that puts both of them in grave danger.

The episode was rated 8.42 from 1177 votes.

Castle - S4E22

#12 - Undead Again (Season 4 - Episode 22)


When Castle and Beckett investigate the murder of a man with human bite marks on his body, Castle's wild theories start flying. But none are as wild as what their only witness insists happened - a Zombie attack. As the evidence pointing towards an undead assailant piles up, the team plunges into New York's Zombie subculture to find the killer and bring him in -- dead, undead or alive

The episode was rated 8.43 from 819 votes.

Castle - S4E7

#11 - Cops & Robbers (Season 4 - Episode 7)

A crew of bank robbers disguised as classic television doctors take hostages which include Castle and Martha. But things are complicated by the fact that Beckett's on the outside having her every move scrutinized by a hostage negotiator and Castle's on the inside with information that the hostages are just a distraction for a more ominous plan.

The episode was rated 8.45 from 820 votes.

Castle - S5E5

#10 - Probable Cause (Season 5 - Episode 5)


While investigating a shocking ritualistic murder, Beckett and her team uncover surprising evidence linking Castle to the killing. As the evidence against him mounts, loyalties are tested. And when surprising revelations come to light, Beckett begins to wonder how well she really knows her new lover and partner of four years

The episode was rated 8.47 from 942 votes.

Castle - S5E1

#9 - After the Storm (Season 5 - Episode 1)

Picking up the morning after, Castle and Beckett now have to decide if they're a couple or was it just a onetime deal. But before they can tackle that, they must deal with those responsible for Kate's mother's death who are now a threat to Beckett.

The episode was rated 8.48 from 956 votes.

Castle - S3E13

#8 - Knockdown (Season 3 - Episode 13)


When the detective who investigated Beckett's mother's murder is shot before Beckett's eyes before he can give her new evidence in the case, Beckett's old wounds are reopened. The investigation of the detective's death leads the team to an old scheme which may provide the answer to why Beckett's mother was murdered and who ordered it. Beckett and Castle's relationship takes a new turn.

The episode was rated 8.49 from 770 votes.

Castle - S2E17

#7 - Tick, Tick, Tick... (1) (Season 2 - Episode 17)

Federal Agent Jordan Shaw, an insightful and accomplished Federal investigator teams up with Castle & Beckett to hunt down a cunning and elusive serial killer.

The episode was rated 8.49 from 813 votes.

Castle - S5E15

#6 - Target (1) (Season 5 - Episode 15)


In the first of a two-episode story arc, Castle and Beckett begin a murder investigation that also exposes a plot to kidnap the daughter of a wealthy Middle Eastern businessman. FBI Agent Harris, an even-keeled professional is brought in to help find the kidnappers.

The episode was rated 8.50 from 922 votes.

Castle - S3E17

#5 - Countdown (2) (Season 3 - Episode 17)

With time running out, Castle and Beckett must put aside their differences with Agent Fallon to avert a city-wide catastrophe.

The episode was rated 8.55 from 782 votes.

Castle - S5E19

#4 - The Lives of Others (Season 5 - Episode 19)


In the show’s 100th episode, Castle finds himself in the unfortunate position of NOT being able to work a case. While he’s holed up in the loft with a broken leg, Beckett goes off to investigate the death of an IRS agent without him, leaving Castle miserable and bored. But when he thinks he witnesses the murder of a young woman in the apartment across the street, he is thrown into a "Rear Window"-esque murder mystery that hits much too close to home.

The episode was rated 8.56 from 1057 votes.

Castle - S3E24

#3 - Knockout (Season 3 - Episode 24)

Kate Beckett's investigation into her mother's death is reactivated when Hal Lockwood - a professional hitman with knowledge of Beckett's mother's murder - stages a spectacular escape during a court hearing. As police launch a manhunt for Lockwood, Castle and the team uncover evidence of a deeper conspiracy involving a mysterious figure with law enforcement connections who is linked to both Lockwood's escape and the killing of Johanna Beckett. The search for Lockwood and the quest to identify his co-conspirator leads to a shocking and deadly conclusion.

The episode was rated 8.61 from 791 votes.

Castle - S5E16

#2 - Hunt (2) (Season 5 - Episode 16)


In the powerful conclusion of a two-episode story arc, when the FBI fails to get his daughter back, Castle takes matters into his own hands, reaching out to a shadowy fixer to help him recover Alexis. But Castle soon learns that his daughter's kidnapping may be part of an even more sinister agenda.

The episode was rated 8.67 from 947 votes.

Castle - S4E23

#1 - Always (Season 4 - Episode 23)

When the murder of an Army veteran puts Beckett on the trail of the man who shot her, Castle must decide how much he's willing to sacrifice to keep her safe. As secrets are revealed and feelings are put on the table, the lives of the detectives at the 12th Precinct may never be the same.

The episode was rated 8.72 from 933 votes.

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