Big Mike, Lester, and Jeff are on their way to Reno in Big Mike's "luxurious yet practical" product-placement Toyota. Driving montage to Billy Ocean. Then they arrive, with Jeff behind the wheel. They all hop out, excited, until they realize it's another campsite. Lester tells Jeff it's not Reno, but Jeff points to a sign: "Renauz, British Columbia." Big Mike starts to beat the crap out of Jeff, but Lester tells him to "stop the killing." Because he's spotted a casino over yonder. They all perk up and head over.
Castle. They're back with Ellie, who asks if they're waiting for a code or something to open the spy will (which has its own code on top; it says "27r3zm7Adc"; I have no idea what it means). Chuck says he was just waiting to open it with her. Chuck and Ellie discuss the magnitude of what's inside that box: Agent X, their dad's obsession, the reason their family fell apart. They open it up and find some stuff that says "Hartley Winterbottom" on it, including a photo... of a young Alexei Volkoff. Casey takes the computer disc and pops it onto a computer. He finds something that says this information is classified. Ellie even remembers Volkoff from Thanksgiving. She can't believe their dad created one of the world's worst criminals for the CIA. Ellie wants to tell their mom, and Chuck thinks she was trying to fix this, too. Sarah wants to call General Redhead. But Casey tells them they pretend they never saw this. He calls them to the interrogation room.
Once there, he unplugs the cameras and audio. He tells them this ends here. Ellie says their dad wanted them to figure this out, and there must be a reason. But Casey says the CIA "created one of the most murderous men in history. Some powerful people spent an enormous amount of energy covering that up. You know what happens if they find out we know? They order a guy like me to put a bullet in each one of our heads. I'm pretty sure your dad didn't want this to end that way."
At home later, Ellie asks Chuck if they're supposed to sweep this under the rug. He says it's the CIA, and there are rules. She wonders what about their dad, and Chuck says maybe he just wanted them to work together, to be honest with each other. As Casey carries the spy will to his secret room in Castle, Ellie says that was only half of it. She wonders what if they're supposed to fix Agent X. "This isn't for the CIA to solve, Chuck. I think this is for us." They're Bartowskis after all. Casey locks up the spy will, and the episode ends.