In the episode, Liz (Tina Fey) helps Frank (Judah Friedlander) hide his relationship with Lynn (Susan Sarandon) from his mother (Patti LuPone) by pretending to be his girlfriend; Jack (Alec Baldwin) advises Kenneth (Jack McBrayer) to destroy a potential rival in his new job; and Jenna (Jane Krakowski) uses skills from an old role to solve the mystery of who took Pete's (Scott Adsit) whisky.
After his mother leaves, Frank admits to Liz that he lied about their relationship to cover up his longtime affair with his old middle school teacher, Lynn Onkman (Susan Sarandon).
Jack (Alec Baldwin) meets Kenneth's new coworker, Bradley (Drew Gehling), in the standards and practices department.
When someone in the office drinks Pete's special whisky, Jenna (Jane Krakowski) resurrects an old character of hers from a police show.
Rather than reveal the betrayal to Pete and break his heart, she forces the culprits to spend the evening with him and humor his boring anecdotes.