‘Castle’ Season 5 Episode 23: “The Human Factor”

On tonight’s Castle season 5, episode 23 “The Human Factor,” when Homeland Security inexplicably seals the crime scene of a car bombing, Castle and Beckett find themselves with two mysteries on their hands: who murdered the victim, a government whistleblower, and why are federal agents trying to take over the case? The plot thickens when they discover that the victim wasn’t killed by a car bomb but by a missile from a military drone.

The series is based on when mystery-thriller writer Richard Castle (Nathan Fillion), who is called in to help investigate a series of copycat murders based on his books. After completely the job, he finds that he enjoys the experience sufficiently to want to continue it. Pulling strings, he arranges to accompany NYPD Detective Kate Beckett (Stana Katic), claiming he wants to study and use her as a personality basis for his next book series. Once that initial case was solved, Castle and Beckett continued to investigate strange homicides in New York, combining Castle’s writer intuition and Beckett’s creative detective work. Over the past four seasons, Castle and Beckett’s relationship has grown even stronger as they’ve dodged bullets, captured killers, and solved countless murder cases with their unorthodox partnership.

Castle stars Fillion, Katic, Susan Sullivan, Molly Quinn, Penny Johnson Jerald, Tamala Jones, Jon Huertas, and Seamus Dever.

Castle season 5, episode 23 “The Human Factor,” airs May 6, 10:00-11:00 p.m., ET/PT on ABC. Spoiler videos below:

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