A routine investigation turns deadly when a gunman takes hostages.
When Castle and Beckett learn that a murder victim may have been poisoned at an Old West-style resort, they visit the resort posing as newlyweds to uncover the truth.
A murder investigation launches Castle into what seems to be an alternate universe where he's never met Kate Beckett.
When a web celebrity is murdered, Castle and Beckett explore the flashy world of internet fame. But when the killer posts pictures from the crime scene on a photo-sharing site, they realize they are up against a social media sociopath who may strike again
A second-grader could crack a case for Castle.
Primate research, big game hunting and Bigfoot all play into the investigation, when Castle and Beckett hunt for a murderer who left giant footprints at the scene.
Castle's stuck in the loft with a broken leg as Beckett investigates an IRS agent's death. Bored and unhappy, Castle spends his time looking out the window where he thinks he's seen a young woman murdered.
A "haunted" video seems to have scared a young woman to death and now Castle is convinced he's next after inadvertently watching the cursed video.
When Castle takes matters into his own hands, after the FBI fail to get Alexis back, he discovers that the kidnapping may be part of something more ominous.
While investigating a murder, Castle and Beckett find a link to a kidnapping plot. FBI Agent Harris is called in to help find the kidnappers.
Significant Others - Sneak Peek
Castle: "A Deadly Affair" Sneak Peek
Castle: 'Knockdown' Sneak Peek
He's not in the car! Beckett rushes to the fiery car crash where Castle could be trapped or worse. Beckett approaches the wreckage in horror and despair. Then... Castle isn't in the car!
Castle tells Alexis her boyfriend has to move out and Alexis responds with some shocking news of her own.
Moderator and TV host Tom Bergeron and series creator/executive producer Andrew W. Marlowe comment on the marketing tactic of publishing a Richard Castle novel, "Heat Wave," in real life.
Series creator/executive producer Andrew W. Marlowe says that season three has been about secrets. Cast member Nathan Fillion (Richard Castle) says that his "Firefly" co-star Adam Baldwin will guest star as Detective Slaughter later this season.
Castle's in the trenches with his next possible lead.
Which may involve leaving a "frog breath" sign on Jason's back.
Did Castle and Beckett just find the gold?
Watch it, Javi!
Castle - 'TICK, TICK, TICK...'
Castle sneak peek.
Preview Episode 4: Castle enters a room with 20 second graders.
Beckett throws down against trolls and haters.
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