Rick Castle as a hard-boiled detective in 1947? This shouldn't be hard for Castle fans to imagine, as it's the role our favorite fictional author has always dreamed of portraying.

And that's what he'll literally do on Monday's "The Blue Butterfly," as a case that involves a stolen treasure and a former cop's diary will take Castle and company back to 1947... in Castle's mind, that is.

Star Tamala Jones - in an interview that will go live on Monday - has labeled the installment her "favorite ever," and it's not hard to see why based on the following clips. We've posted SIX sneak peeks, most of which focus on Castle's hilarious fantasy world, so sit back and enjoy now:

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