After their romantic weekend getaway to the Hamptons, Rick Castle and Kate Beckett are walking on a cloud inside their own little honeymoon bubble — but all that could burst in next week's episode.

According to the official show synopsis for Castle Season 5, Episode 5: "Probable Cause," Beckett and the team find sufficient evidence to link Castle to a gruesome crime scene. Could the mystery writer really be capable of murder? It wouldn't be the first time a goodlooking man turned out to be a serial killer …

But this is Castle, not Dexter, which means it's most likely one big misunderstanding. However, this crazy ordeal could give Beckett probable cause to doubt her man's intentions. In the immortal words of Charlotte York, “How well do we ever know the people we sleep with?”

Check out the show synopsis below, and share your expert theories in the comments!

"While investigating a shocking ritualistic murder, Beckett and her team uncover surprising evidence linking Castle to the killing. As the evidence against him mounts, loyalties are tested, and when surprising revelations come to light, Beckett begins to wonder how well she really knows her new lover and partner of four years."

Guest stars include Alexa Havins as Elle Daniels, Romi Dias as ADA Toni Gonzalez, Gerald Downey as Lloyd Kurtzman.

Original Air Date: Castle Season 5, Episode 5: "Probable Cause" airs on Monday, Oct. 29, 2012 at 10 p.m. ET on ABC.


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