Andy walks into work disappointed. Everybody fears that he's discovered the truth about Angela's affair with Dwight, but instead, Andy says he's upset because nobody has sent their RSVPs in for the wedding. Michael is surprised Andy still doesn't know about the affair, but Jim shuts him up before he can spill the beans.
While in the kitchen and away from Andy, Michael asks Dwight if he and Angela are still having intercourse. Dwight can't deny his answer. Oscar steps in and asks if they have had sex in the office. Oscar is shocked as Dwight hints around that it was on Oscar's desk. Later on, Kevin taunts Angela for not coming clean about her affair.
Dwight asks Angela to confess the affair to Andy and she refuses. Michael hates the idea of the entire office -- except Andy -- knowing about Angela and Dwight. He calls a meeting with Jim and Dwight on how they can break the news to Andy. Dwight warns Michael that when he gets the word out, things might turn ugly.
Michael calls Andy to the parking lot and there, tells him about Angela's affair. Before Michael has time to see Andy's reaction, he drives off to meet with David Wallace in New York. Once in New York, David delivers Michael some surprising news: the Scranton branch is outperforming all the other Dunder Mifflin branches and Michael must be doing something right.
Back in Scranton, Andy calls Angela into the conference room and confronts her. She admits to the affair, but tells Andy she still wants to marry him. They leave the room and find all the employees curious about what happened behind the closed doors.
Andy approaches Dwight to tell him that Angela is going to break the affair off in order to become Mrs. Angela Bernard. Dwight refuses to believe Angela chose Andy over him and after the two argue, they agree to a duel in the parking lot. The winner gets Angela's heart. Pam tries to get Angela to stop the fight, but Angela seems into the idea.
Dwight shows up in the parking lot, armed with weapons for his duel. He finds a note and as he reads it, the office gathers around the window to spot Andy approaching Dwight from behind in his Prius. Andy slowly sandwiches Dwight between his car and the parking lot wall as Dwight keeps challenging Andy to fight him like a man while attacking the hood of his car.
During their heated argument, Andy tells Dwight he's slept with Angela twice. Dwight gets angry because Angela told him he was the only one she was sleeping with. As the rest of the office waits for the results of the duel, Andy and Dwight both arrive, looking angry and both refusing to make eye contact with Angela. Angela begins to realize she might have lost both of them.