The gang at the 12th precinct go all out in the hopes that a delusional witness will lead them to a killer on Castle. "That '70s Show" is the 20th episode of the show's sixth season.
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Whoever the dead man is, it appears he put up quite a struggle. Lanie checks out the latest body on Castle.
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Lanie, Castle, and Ryan are swapping theories but at this point they have no idea that their latest murder will lead them to the Captain's estranged sister.
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Castle is intrigued by the latest murder. Wait until he finds out the victim is a confidential informant.
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It's pretty rare for Beckett to wear pink on the job which is a shame. She looks gorgeous in the color.
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An investigation takes a serious turn when he U.S. Attorney is involved on Castle. "The Greater Good" is the 19th episode of the show's sixth season.
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A dead confidential informant brings new faces to the 12th precinct on Castle.
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Castle and Beckett have a new murder to solve and it looks like Kate's got another new coat to do it in.
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Castle Quotes

Beckett: Wait, there's a sex scene in the book? Between us?
Castle: There's a sex scene between Nikki Heat and the roguishly handsome reporter who's helping her.
Beckett: Oh, good. So he's nothing like you.

So how did she take it, us being together?

Beckett