Rick and Kate’s working honeymoon may turn out to be an embarrassment of riches for the couple.

On Monday’s Castle (10/9c, ABC), the newlyweds go undercover at an Old West-style resort to catch a killer, and, as you can see in the exclusive clip above, stumble upon a veritable treasure trove.

Or so Rick thinks.

Press PLAY above and watch Nathan Fillion hilariously channel his inner Indiana Jones (or is he a Goonie?).