Meanwhile, Terry and Rosa visit a "silent" disco to uncover new leads for their new drug task force. There's a mole in the precinct and Holt and Jake need to find out who it is before Deputy Chief Madeline Wuntch gets wind of it. Meanwhile, Gina is upset that her dance team, Floorgasm, kicks her off the squad and Terry confronts her about her bad attitude. The Peralta/Holt annual Halloween bet continues when Jake challenges the Captain that he can steal his watch before midnight. The precinct holds a competition while on stand-by for a motorcade, Holt has another run-in with Deputy Chief Wuntch, Boyle needs to get an incriminating videotape from Hitchcock, and Diaz suspects Peralta still has feelings for Santiago. Holt's old nemesis is in charge of the precinct inspection, Peralta and Jeffords investigate a stabbing before Jeffords goes in for his vasectomy, and Boyle needs a plus-one for his ex-wife's engagement party. But can Charles keep his new secret from Jake? Jake enlists Charles' help to track him down, and Holt tests the squad with practice drills. Jake's undercover operation ends in a successful sting, until he learns one mobster has gotten away.