full size Lanie and Rick Look Worried in Castle Season 5, Episode 5: "Probable Cause"
Credit: Richard Cartwright/ABC Television Group © 2011 Disney

Last week's Castle-less Monday left us in major Caskett withdrawal, but fear not! Our favorite crime procedural returns tonight with Season 5, Episode 5: "Probable Cause," and we have probable cause to believe that it's gonna be a nailbiter!

HOW WILL HURRICANE SANDY AFFECT TONIGHT'S PROGRAMMING?

Read on at your own risk for more info and minor spoilers about tonight's all-new episode!

When Castle's fingerprints are found at the scene of a brutal, ritualist murder, Beckett begins to question how well she really knows her new boyfriend. Could he somehow be connected to the victim? Or — even worse — could he be a secret serial killer? We shudder to think!

Click here for a chilling sneak peek of Rick Castle getting arrested … for murder!

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

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Spoiler Photos of Castle Season 5, Episode 5: "Probable Cause" (PHOTOS)

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