Season 3, Episode 3 Under the Gun
First Aired: October 4, 2010
Encoded evidence sparks Castle's imagination during the investigation into a bail bondsman's murder, but Beckett dismisses his wild theories. Meanwhile, Beckett's reunion with her ex-partner turns romantic, much to Castle's chagrin.
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- Premiered: March 9, 2009
- Rating: TV-PG
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- Premise: A murder-mystery writer and a homicide detective team up to solve unusual crimes in New York City, and their professional relationship soon crosses the line into romance. (more)