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Castle (2009) Season 3 Episode 3 - Under the Gun
When a coded document hidden by a murdered bail bondsman gets Castle’s imagination running wild, Beckett must steer the case back to the violent felons who populated their victim’s world – only to discover that maybe Castle’s crazy theories aren’t so crazy after all. Complicating matters is the surprise arrival of Beckett’s ex-partner. As the two reunite over a history that Castle has no part of, Castle is forced to watch the relationship take a turn towards the romantic.
Air Date: 4 Oct 2010