As far as the case, Castle believes there’s something of value amongst the storage unit junk. He smashes open the Gemini figurine. It’s empty. That’s because it’s the one Captain Gates brought from home. Remember how she was starting to like Castle? Now… not so much. Castle smashes the other figurine to find a glass eye and a USB drive inside.
The thumb drive contains photos from the hit and run accident that killed the mother and father of the twins. Wendell was on a mission to find the driver. That’s what led him to work for the lady with the silent “g.” Wendell knew the person responsible for the death of his parents was Angelica’s live-in servant. He stole the guy’s glass eye to prove he was the driver through DNA. This revelation allows Castle make a statement he’s been waiting to utter for many, many years. He exclaims, “The butler did it!” Case closed.
Now we said there were a lot of memorable moments outside the case. Beckett getting Castle coffee for a change is one. Castle also wants to kiss Beckett smack dab in the middle of the squad room. They have to settle for the best handshake ever. Finally, Castle finds a little stick man in Beckett’s desk. There’s a nice story behind it about when her dad took her to Coney Island just after her mom’s funeral. The stick man she made with her dad that day serves as a reminder that even on the worst days there’s a possibility for joy. Nice.