Will the Castle Season 5 finale put the final nail in Caskett?

That's what the series wants viewers to believe is possible, as "Watershed" will focus on Beckett's job opportunity with a high-profile federal law enforcement agency in D.C. Will she actually take the gig?

Before that decision is reached, she'll get into it with Castle when he discovered its mere existence... along with the fact that she interviewed for the promotion without telling him. That's never a recommended move.

Watch the couple argue over Beckett's omission of truth in this sneak peek from the finale:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.