Sneak Peek of Castle Season 5, Episode 10, “Significant Others”: Rick and Kate Question an Unhinged Murder Suspect (VIDEO)

While Rick and Kate question a murder suspect, things take a turn for the creepy. Is this unhinged man a danger to our favorite couple? We’ll have to wait until Monday to find out! Original Air Date: Castle Season 5, Episode 10: "Significant Others" airs on Monday, Jan. 7, 2013 at 10 p.m. ET on ABC.


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