Trama

When Sarah's old spy handler reappears, she goes off on her own to prevent a secret from her past from destroying her family.

BUDAPEST - FIVE YEARS AGO

Sarah (Yvonne Strahovski) listens in on her mobile phone, only she's listening to a bug. Her handler, Kieran Ryker (), tells her to proceed to the mansion. A group of 11 criminals murdered the people who lived there, and it was her job to take them out. A pair of automatic weapons, some impressive flips, and and a couple of knives later, 11 criminals dead. But thn she hears a baby crying. The baby was the real reason she was there. Ryker orders her to take the baby. She's hesitant, but she shoots her way out.

BURBANK - PRESENT DAY

Sarah figures out what Shaw did: he let Ryker know the baby was alive. She was ready to go off after her, but Chuck (Zachary Levi) had a surprise for her first. He took her over to her dream house, having gotten the key by charming the real estate agent. He set up dinner and candlelight on the floor for her, pointing out where some of the things in their new house would be, particularly the door frame where his dad used to mark how much Ellie and he had grown. Tenth grade was a good year for Chuck, when he outgrew Ellie. Sarah tells him she has to do something and can't tell him what it is. In spite of his protests that they weren't supposed to keep secrets from each other anymore, she still couldn't tell him.

BUDAPEST - FIVE YEARS AGO

Sarah meets Ryker at a cafe and brings a stroller with her. She questions why he wanted the baby so much. She correctly suspected the mission was off-book: Ryker was going to take the baby, who was the sole heir to her parents' huge fortune. Sarah wondered if Ryker would kill her once he got the money, and the gun he held under the table at her would seem to think he would. She reached for the baby, only she never brought it. She hid a gun in the stroller and shot him, disappearing into a crowd. The baby was still in her safehouse in Budapest.

BURBANK

Chuck, Casey (Adam Baldwin), and Morgan (Joshua Gomez) tried to convince Sarah not to go off on her own. Chuck said he would try not to ask questions as her husband, but as the head of Carmichael Industries, their services were at her disposal. ("Pro bono, of course.") Sarah relents a bit, telling them about Ryker. She replied to Ryker's message pretending to be Shaw and set up a meet in Budapest. Chuck and Casey would go to assist. Meanwhile, Morgan was to hold down the fort in Castle. He was a bit disappointed, having corralled Ellie (Sarah Lancaster) and Devon (Ryan McPartlin) into having a game night so he could work on winning back Alex (Mekenna Melvin). Chuck suggested having Game Night in Castle.

In Budapest, Casey and Chuck are to watch over the cafe while Sarah goes to meet with Ryker. She planned to find him and kill him. Chuck was worried enough already, and Casey telling him Ryker's file had been redacted after his incident with Sarah didn't help matters. At the cafe, a waiter slips a note under a coffee, telling Sarah to get on a bus and go to another address. She sends Chuck and Casey after the waiter while she gets on the bus, despite Chuck's strenuous protests.

Back at Castle, Ellie and Devon are in the mood to look around Castle and see all of the goodies, but they try to play wingmen for Morgan as he works on Alex. It isn't going well, so Ellie and Devon engineer the game of Life so that Devon wins and everybody can be off on their own. While Ellie and Devon play spy/torturer (and Ellie gets her earring caught in a belt of ammunition), Morgan tries to say how wrong he was to Alex for breaking up in a text. It isn't going well, so Ellie and Devon try a little divide-and-conquer. Ellie tells Morgan about how Devon and she broke up for a while after they had been dating for a year. Devon used to be an Abercrombie & Fitch model, and he developed an attitude, even giving Ellie a signed picture of him shirtless for an anniversary gift. Devon admitted to Alex he was being a jerk, so he did the full-court press on Ellie to get her back. What convinced Ellie was overhearing Devon talking to his mother about how wonderful she was and how idiotic he felt by acting the way he did.

Meanwhile, Chuck tackles the waiter, proud that he didn't need the Intersect...only the waiter spoke Hungarian. Eventually they find someone to translate, who tells them the guy just got paid to put the napkin under the coffee. Casey thinks he knows more and "communicates" with the man.

Flashing back to Budapest five years ago, Sarah calls her mother, Emma, to ask for advice when the baby is crying, despite being fed and recently diapered. Emma () tells her to hold the baby close to her, rock her back and forth so she feels safe and secure, and Sarah even sings the lullaby her mother sang to her: Slumber, My Darling. It works; the baby falls asleep in Sarah's arms.

Sarah makes it to the rendezvous and gets the drop on Ryker, only she hears a baby crying. She thinks he already found the child, only to discover it was a recording. Ryker knocks her out and ties her up. He already knew Shaw was in prison, so her fake email only confirmed the baby was still alive. He's ready to kill her, thinking she had no backup. Only she did, and they delivered the waiter to her. Casey opens fire on Ryker's men while Chuck unties the unconscious Sarah. They get her out of there.

Back in Burbank, Chuck does a rare thing: confronts Sarah and tells her she was wrong to attempt the mission alone. She agrees and tells Chuck the entire story. She tried calling her old CIA director, Langston Graham (Tony Todd), only he had no way of guaranteeing the baby's safety or making sure Ryker couldn't find her. Sarah lies and says she didn't have the baby. Sporting a hairdo not too unlike Farrah Fawcett's famous style, she brings the baby to her mother, asking her to take care of her. She confessed because of her work in the CIA, she couldn't ever see her mother or the child again. Otherwise, she would risk losing both of them. Her mother was still upset Sarah decided to go with her father. She told Sarah wasn't going to force her to play soccer games or go to the prom, but she wanted Sarah to have the chance to do all of that if she wanted, something her father couldn't provide. A tearful Sarah asked her mother to make sure the baby had all of those opportunities. She admits to Chuck she was wrong for not trusting them, but not trusting people was all she was ever taught. Chuck thanks her for opening up to him, but his phone starts getting interference. He holds it close to Sarah's head and finds a transmitter in her hair. Ryker placed it there while she was unconscious and now knows where the baby is.

Sarah tries calling her mom but only gets voicemail. She hopes the emergency signal she gave her mother would activate so she knew to go to the emergency location. Ryker and his team make it to Emma's house and he trains a gun on her as she's washing the dishes. However, it's Sarah hiding another gun. The two fight it out through the house while Casey and Chuck take out Ryker's men outside. Eventually, Ryker gets the upper hand and is ready to choke Sarah to death, since finding the baby was only part of his mission now. Ryker was about to teach her a lesson the hard way.

RYKER: Even when you have a team, you're still alone.

But Sarah wasn't alone, and the shots coming from Ryker's men outside were the distraction she needed to take a knife and plunge it through his heart.

The trio run back to Chuck and Sarah's apartment, where they find the little girl, Molly, playing videogames with Morgan and Emma looking at pictures of their wedding. Sarah bonds with her younger sister while Emma thanks Chuck for providing her with everything she hoped Sarah would have one day. Everybody settles down to a big dinner, and Alex takes Morgan back, having seen how good of a person he is playing with Molly.

Chuck and Sarah return to their dream house, where Sarah tells Chuck that she was a different person than she was five years ago. The proof lay in where she told Director Graham she was done with handlers. He agreed, making her the handler instead. Her assignment: investigate a computer repair expert at an electronics store in Burbank. But she didn't want that life anymore, and she was afraid going back to the CIA would be more of the same. She told Chuck she planned to turn down Beckman's offer. Chuck supported it, but he was sorry he couldn't get her dream house. But she carved her name in the door frame anyway, confident they would own the house one day.