Detective Ethan Slaughter (guest star Adam Baldwin) returns when he ends up needing Castle's help on a robbery case but given how their last encounter went, will Rick be game?
And when a dead body turns up, the robbery case quickly becomes a homicide with Detective Slaughter as the main suspect. Will Castle be able to figure out if Slaughter is innocent or guilty of murder?
Check out these photos from Castle Season 8 Episode 6, "Cool Boys" scheduled to air Monday, November 9th on ABC.
If you can't wait, you can always watch Castle online here at TV Fanatic.
Detective Slaughter Returns - Castle
Detective Ethan Slaughter returns. What kinds of trouble will he get Rick Castle into this time?
Slaughter Plays Rough - Castle Season 8 Episode 6
We know from his last visit that Detective Slaughter likes to play rough but that just isn't Richard Castle's style.
Things Get Tense - Castle Season 8 Episode 6
So just how tense will things get between the rough, gruff, detective and the husband of the 12th precinct's new Captain?
Guns Drawn - Castle Season 8 Episode 6
Well, if Ryan and Esposito barreling in with guns drawn is any indication, we'd say things are about to get pretty tense.
Not Big Fans of Slaughter - Castle Season 8 Episode 6
Ryan and Esposito weren't exactly big fans of Detective Slaughter the last time Castle ended up working with him.
Slapping the Cuffs on Slaughter - Castle Season 8 Episode 6
We think Ryan and Espo are more than happy to slap the cuffs on Slaughter if there's a reason.