After Holt is transferred to the NYPD Department of Public Relations, the new captain's arrival causes the precinct to dissolve into chaos, despite Terry's best efforts to keep everyone on point.
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 soulmate in Genevieve, an art gallery owner, and he tries to help set them up. Meanwhile, Rosa deals with inter-precinct theft and Holt seeks Amy's help with an image campaign
When investigating a serial killer, Jake enlists Holt's help in an attempt to solve the case off the radar. At the precinct, Rosa and Amy are forced to deal with demands from an old adversary and Terry discovers a new obsession
The third installment of Captain Holt and Jake's Halloween heist culminates with a tie-breaking competition to claim the title of "amazing detective slash genius." This year, Jake and Holt split the squad into two teams to help them win.
Jake and Charles convince Terry to take a weekend camping trip as a much needed "babymoon," but they soon realize it might not be the idealistic weekend for which they had hoped. Meanwhile back at the precinct, Holt gives Rosa some important relationship advice and Amy enlists Gina's help to prepare her for an important presentation.
Jake and Amy convince the Captain to let them work a case together involving a new street drug, but their new relationship gets in the way. Meanwhile, at the precinct, Charles panics when he realizes he's damaged one of Holt's prized possessions and Terry teaches Rosa a lesson in discipline
Terry leaves Jake in charge of entertaining his pregnant wife, Sharon, while he and Rosa head to Rikers to learn more about the Douglass Street murders. But when Sharon's water breaks sooner than expected, crisis ensues at the precinct. Meanwhile, due to an internet outage, Amy and Charles must process all the paperwork by hand to avoid the bullpen from overflowing with perps and Holt is forced to confront his ex-boyfriend.
In an attempt to solve an international case, Jake and Rosa are forced to work with a pair of Swedish cops and things get very competitive, very quickly. Meanwhile, Amy and Terry offer to help Gina prepare for a big test and Holt enlists Charles to sub in as his squash partner for an annual tournament
Jake, Charles and Gina are involved in a real-life "Die Hard" situation while off-duty on Christmas Eve, and Terry must leave his family celebration to try to save his squad. Meanwhile, Amy tries to prove she's just as tough as Holt and Rosa
Charles and Genevieve want to take their relationship to a new level, but his ex-wife, Eleanor, steamrolls their plans. Meanwhile, Amy asks Terry to write a recommendation letter with disastrous results, and Holt and Rosa enlist Gina's help to solve a case.
When Captain Holt and Jake accidentally contract the mumps during an investigation, they decide to be quarantined together in hopes of still solving the case. Meanwhile, Rosa tries to help Boyle through a mourning process, and Terry is forced to clean up Hitchcock and Scully's mess.
After Jake and Amy go on their first vacation together on a cruise ship, they bump intp an adversary. Gina and Terry attempt to help Captain Holt after his sister shows up unexpectedly.
Jake decides to introduce Amy to his mother but he ends up being surprised by the appearance of his father.
Charles feels jealous after Jake is reunited with his former partner who now works in the next precinct.
Hitchcock and Scully become involved in one of Jake's biggest cases in an effort to prove themselves. Gina and Amy help Rosa deal with a fear.