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As Andy flaunts a discovery he made about his ancestry, Darryl struggles in his new role; Dwight teaches a language to Erin, who wants to impress her boyfriend's educated family; Jim reveals a secret.

When Jim convinces Dwight the building is unsafe, Dwight rents a bus to use as his office; Nellie asks for Andy's help; Jim uses pie to cheer Pam.

Andy must step up when his dad loses all his family's money; when Dwight is a guest on a radio show, his co-workers call in to torture him; Kevin learns a secret about Oscar.

The women of the office try to teach Dwight how to interact with female clients; Angela suspects the senator of cheating; Toby convinces some of the guys to grow mustaches.

When Angela finds out about her husband's affair, she goes to Dwight for help; Stanley and Phyllis take advantage of Jim when he needs a favor; Pete distracts Pam as she begins painting her mural.

Dwight picks up the slack when the party planning committee fails to plan a Christmas party; Darryl worries Jim has forgotten the promise he made; Pete teaches Erin about "Die Hard."

Leslie asks Dave and Andy to help her catch a teenage vandal; Ann tries to throw a fun Halloween party.

Leslie learns the library department, which is run by Ron's ex-wife (Megan Mullally), wants to take over her lot; Andy gets a job in hopes of winning back Ann.