Nobody in the precinct likes the new captain, Wuntch continues to humiliate Holt as he takes his new job in Public Relations, and Jake and Amy try to figure out what to do next after their kiss.
The Nine-Nine gets another personnel change that could put Jake and Amy's budding relationship at risk. Meanwhile, Terry assists Holt with an important public relations matter, and Rosa and Gina try to convince Charles to rethink his affection for a fellow officer.
Jake thinks Boyle might have met his soul-mate in Genevieve, an art gallery owner, and he tries to help set them up. Meanwhile, Rosa deals with intra-precinct theft and Holt seeks Amy's help with an image campaign.
Jake and Amy work together on a case, and wind up arguing over Jake's old, worn-out mattress. Meanwhile, Boyle scratches Holt's prized car, and the teenage boy Rosa sponsors as a "big brother" is in trouble with the law.
Jake and Rosa investigate a case in which they have to assist InterPol. Amy and Terry team up to help Gina study for an exam, while Captain Holt recruits Charles to double with him in a squash tournament.
Jake, Charles and Gina get into trouble while doing last-minute Christmas shopping, Terry tries to make it through the holidays without a call from the precinct, and Amy takes part in a "Polar Swim" with Holt and Diaz.
Jake helps Charles reclaim the rights to his sperm from his ex-wife, Amy accidentally breaks Terry's nose after asking for a recommendation, and Gina helps interrogate a suspect who refuses to speak to anyone but her.
Peralta and Holt contract the Mumps while working on a cold case. Terry takes over the precinct in his place, but his ambitious plans ultimately fail. Boyle is sad over the death of his dog, but Diaz doesn't understand it.
Jake comes face-to-face with his old nemesis Doug Judy as he and Amy go on a cruise. Meanwhile, Holt's sister comes to town for a visit, and Diaz and Boyle fight over a rent-controlled apartment which was a crime scene.
On Jake's birthday, his Mom tells him she is back together with his hated father. Meanwhile, Charles has an embarrassing moment with a body cam, and Holt's "Escape the Room" exercise for the Nine-Nine does not go as planned.
Chaos ensues when the Nine-Nine is forced to share their station with the Nine-Eight precinct while their station is closed, and Charles consequently becomes jealous of Jake's old partner, who is an officer in the Nine-Eight.
Trying to get called to a "celebrity" case, Jake tricks Hitchcock and Scully into taking a case that might be more dangerous than everyone thought. Amy, Rosa, and Gina take the day to conquer their worst fears
The precinct gains a new detective who has just completed a 12-year undercover job with the mob, Charles' latest mess prompts the janitors to refuse to clean the precinct, and Gina directs a video for Holt.
While Holt is en route to visit Kevin in Paris, Jake and Amy inadvertently lose his dog. Meanwhile, Charles has laser eye surgery, and the sexual tension between Rosa and Adrian Pimento disgusts Terry.
Terry enlists Jake's help in solving a twenty year old case which his old precinct never let him forget, Charles allows Adrian Pimento to stay at his place and soon regrets it, while Amy, Rosa and Holt attend a class together.
The precinct tries to set up perfect bachelor and bachelorette parties for Adrian and Rosa after they announce their engagement, but Adrian's party falls apart when he tells everyone that someone is stalking him and steals the party bus.
With Adrian off the grid and in hiding, the rest of the squad scramble to track down the sister of Figgis, the mobster behind the operation, and throw a fake funeral to flush out Figgis' hit man.
While Amy continues to work on Figgis' sister Maura on the inside, Jake, Rosa and Holt team up with Bob Annderson to track down the FBI mole. Meanwhile, Gina helps Terry work out the culprit behind a press leak.
After a surprising turn of events in the Nine-Nine's attempt to track down Adrian Pimento's hitman, the precinct drops everything when they suspect Holt is in danger.
