In the episode, Carina returns with a new mission for Team Bartowski – steal back a stolen weapon from her "fiancé", an arms dealer named Karl Stromberg.

While Sarah and Carina are out, Chuck and Morgan are sitting around their largely unfurnished apartment playing video games.

In an effort to cheer Chuck up, Morgan takes him out on the town but by chance they end up at the same club as Sarah and Carina.

While Chuck greets Carina the massive man from the opening arrives, whom she identifies as her fiancé, Karl Stromberg.

Stromberg has been wired a sizable amount of money for the weapon he's carrying, and Carina has pretended to fall in love with him to get close.

At the party the next day, Chuck tries to talk with Sarah about what happened in Prague while waiting for their chance to move on Stromberg's vault, but she coldly rebuffs him.

Sarah is impressed as he retrieves the weapon and makes it out, only to accidentally trigger the alarm when he reaches her again and tells her it's time to talk.

While two of Stromberg's goons are dispatched to investigate, Sarah attempts to pick the lock but instead breaks into a vent to shut off the gas before Chuck can suffocate.

Sarah ambushes the guards from the ventilation shaft and opens the door only for Chuck to collapse into her arms with the words "I love you."

Later the team discovers Carina is missing and meets to discuss the situation at Casey's apartment while Morgan's party rages in the background.

While Casey evacuates the apartment by spraying the party-goers with his garden hose in the guise of an "angry neighbor," Chuck and Sarah prepare to incapacitate the guards with firearms and a tiki lantern.

Chuck persuades his team to break the standoff by setting aside their weapons, then throws the lantern into the complex's fountain, which is filled with Jeff's highly-flammable "Jail Juice".

In Beckman's office she begs the man she's speaking with to allow her to fill the team in on the full situation due to the danger involved.

While partying at the club with Chuck, Morgan repeatedly fails to hook up with any of the women there, or even get close to the bar.

Back at work, after Chuck fails to deliver the invitation and Jeff and Lester berate Morgan, he seeks advice from Big Mike, lamenting that Carina can't even remember his name.

While the two prepare for the engagement party she spots the charm bracelet Chuck gave her[1] among her jewelry and suggests she wear it as being something someone in love might do, but Sarah declines.

After Carina leaves, Sarah plugs it into Castle's computer, and discovers it is the full recording of Chuck's confession while trapped in the vault.

Her eyes fill with tears when she learns that the reason Chuck chose his spy training over her in Prague is because of the encouragement she herself gave him, the knowledge that he had the chance to do something good, and that he knew he had to make a sacrifice to protect everyone including his friends, family and Sarah.