Next morning at Ellie and Awesome's, Mary says she'll see her next week, but to call if she needs anything. Mary stops to think, then walks. Awesome uses the baby monitor (which is apparently two-way) to call and tell "Hot Mama" that the target's on the move. Ellie replies "Copy that, Six Pack." She's got the baby, and he needs to get the car.

Buy More. Casey apparently has time for a quick shift. He checks his locker and finds a graduation invitation from Alex, telling him to meet her at 8 at the shooting range, to celebrate. He smiles.

Mary shows up at Castle, and Chuck asks her what's going on. She tells him that his sister is breaking through the firewalls of the Orion computer. Chuck says he had Awesome take out the hard drive, but Mary says he didn't do it. Mary says it's almost as if Bakula intended Ellie to figure this out. She says she took the dangerous stuff from the computer, but Ellie's onto her and is following her. Chuck wonders what to do, so Mary tells him the time has come for Ellie to find out what Chuck does for the CIA. He protests, but Mary tells him Ellie's going to find out one way or another, and she'd probably take it better coming from him. Casey interrupts to tell Bartowski (the elder) that General Redhead's on the monitor for her. Mary tells the General that she'd like this file she took from the computer to be the last; it's not going to be easy to keep secrets from her daughter any longer. General Redhead says that Washington wants to expand the Intersect program, and Ellie's unlocked secrets their most skilled technicians couldn't. General Redhead's never even heard of Agent X. Mary hasn't either, but says it isn't necessarily related to the Intersect. Still, General Redhead would like Ellie to keep working, because she has exclusive access. Mary tells "Diane" that Ellie's not a spy, but General Redhead says it comes from the top. She shuts off just as Volkoff starts singing Danny Boy. Mary asks why the hell he's here, and Chuck explains the Norseman. Mary tells Chuck to watch his back, but Chuck says he's changed and wants to make amends with Mary. She tells Chuck this is Alexei Volkoff, he of twisted mind and shady dealings. Never trust him. Chuck: "Cool."

Fake snow and a cave. This must be Switzerland. Sarah and Casey are on lookout. Sarah sees no guns or agents, and wonders if maybe this isn't a trap at all. Casey growls that you can't trust a limey with good teeth, so he wouldn't rule out "trap" just yet. Casey calls Chuck on their watches/earpieces and tells him if they lose audio, they're coming in. Chuck likes that idea. Volkoff says there's only one way to open the door into the vault: playing a game of chess with a five-minute clock. Chuck guesses there are consequences for losing. Volkoff says there is, and Chuck can leave if he wants. But Chuck handcuffs himself to Volkoff instead. As the chess game begins inside, Casey and Sarah discuss the prenup outside. She says that by Chuck playing it cool, she realizes how he feels every time she plays a big deal cool and he flips out. She now wants to flip out about boiling their relationship down to the contents of an envelope and seeing the end before they begin. Casey asks why the prenup, then? She tells him she has money socked away in case her dad gets arrested again. Casey tells her he's sure Chuck can handle her telling him that; "any excuse to weep, and hug." Sarah says it's more about what it drudges up for her: her parents' relationship and having to take sides. She says it's hard to be caught in the middle. Casey rogers that.