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.
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 from 985 votes.
#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 from 1013 votes.
#3 – Knockout
Season 3 – Episode 24
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 episode was rated from 826 votes.
#4 – 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 from 819 votes.
#5 – 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 from 1145 votes.
#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 (Dylan Walsh), an even-keeled professional is brought in to help find the kidnappers.
The episode was rated from 987 votes.
#7 – 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.
The episode was rated from 800 votes.
#8 – After the Storm
Season 5 – Episode 1
After four seasons of “will they” or “won’t they,” Richard Castle and Kate Beckett finally gave in to their feelings for each other. Season 5 picks up on the proverbial morning after, with Castle and Beckett facing new questions — Was this a one-time fling, or are they now a couple? But before they find the answers, they must take on the forces responsible for Beckett’s mother’s murder that now threaten Kate Beckett’s life.
The episode was rated from 1028 votes.
#9 – 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 from 842 votes.
#10 – Cops & Robbers
Season 4 – Episode 7
When Castle and Martha are taken hostage by a crew of bank robbers dressed in hospital scrubs and using classic television doctor names, Beckett finds herself on the outside, desperately trying to rescue them — which proves to be even more difficult with a by-the-book hostage negotiator watching her every move. Castle becomes the de facto leader of the hostages and discovers that the robbery is actually a skillfully orchestrated distraction for an even more sinister plan. But with Castle stuck on the inside and Beckett on the outside, will either be able to foil the bank robbers’ plans before it is too late?
The episode was rated from 859 votes.