Credit: ABC Photo: Alexis Helps Castle in 3

We’re happy with any episode of Castle airing on Monday nights, but we espesh love the new ones. Lucky for us, Castle will be back on Valentine's Day with a brand new eppy with a sexually-charged (but highly misleading) title, “The Final Nail.”

If you haven’t heard the scoop, this ep is about the death of an interior decorator. The interior decorator is the wife of hot guest star o’ the week, Jason Wiles, who plays Richard Castle’s old buddy, Damian Westlake. Westlake turns out to be a prime suspect in his own wife’s murder —  putting Castle and Beckett at serious odds with each other. Castle obvi doesn’t want to arrest an old chum! But it’s a def possibility that Castle’s buddy is a “cold-blooded killer” — one Beckett isn’t afraid to take down.

Official synopsis below:

"The Final Nail" — Castle and Beckett find themselves on opposite sides of the case when Castle's old school friend (guest star Jason Wiles) emerges as the prime suspect in his own wife's murder. As they work to solve the crime, Castle comes to realize that one of two terrible things must be true... Either Detective Beckett is about to arrest an innocent man for murder, or his old friend is a cold-blooded killer, on "Castle," Monday, February 14 (10:01/9:01c) on the ABC Television Network.

Source: Castle Spoilers