'Castle' Episode 5.5 Photos: Castle Is a Suspect in 'Probable Cause'

The investigation of a ritualistic murder brings up some surprising links to Castle. With the evidence growing, Beckett begins to wonder if she knows her partner (and now lover) at all. "Probable Cause" airs on Monday, October 29 at 10pm on ABC.
By Laurel Brown

Talk About 'Castle' Episode 5.5 Photos: Castle Is a Suspect in 'Probable Cause'

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