It's been three years since the BBC documentary crew first arrived at the office. Back for one last visit, they find Gareth Keenan now in charge and is running the office with a military precision.
Months have passed since the end of season two. Jim has transferred to the Stamford branch, and Pam has broken off her engagement with Roy. Michael learns that Oscar is gay, and with Dwight, contacts Jim regarding buying a “gaydar” machine to figure out who else in the office is gay. Michael accidentally outs Oscar to everyone.
Tim's world is rocked when Dawn turns up at the office to say hello. Despite a stern warning from Gareth and wise words from Keith in Accounts, Tim can't help but get his hopes up again. Meanwhile, David Brent has been using the services of a dating agency and, in between making celebrity appearances in nightclubs, he meets up for drinks with a rather disappointing selection of single women.
Michael and Dwight leave for a convention in Philadelphia, where they meet Josh, the manager of Dunder Mifflin Stamford, and Jim. Michael feels threatened by Josh, and attempts to one-up him by throwing a party in his hotel room. When no one shows up, Jim takes pity on Michael, telling him that he is a good boss and was not the reason he left Scranton. Meanwhile, Kelly sets Pam up on a blind date that goes poorly. Michael ends up making a big sale without putting much effort.