Watch Castle Online: Season 8 Episode 4

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When Dave Johnson is murdered in a church, Esposito and Ryan are on the case.

But when Castle finds out the victim may also be his favorite author, he ends up in the middle of the investigation in Castle Season 8 Episode 4, "What Lies Beneath"

Will helping crack the case bring him any closer to Beckett? How far will Ryan go to make a few extra bucks and what exactly does Martha have to say when she heads to the 12th precinct to visit her wayward daughter in law? 

To find out, watch Castle online here at TV Fanatic. 

C. Orlando is a TV Fanatic Staff Writer. Follow her on Twitter.

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Castle Season 8 Episode 4 Quotes

Beckett: Martha, we're not getting a divorce.
Martha: Well, call me old fashioned but don't married couples live together?

Beckett: It's complicated.
Martha: So were his last two divorces.