Amy returns from maternity leave. Jake and Rosa work a difficult case.

When the FBI takes over a high-profile case, Jake keeps digging. Amy and Rosa negotiate with O'Sullivan and the police union.

Gina invites Jake and Terry over to her new place. Holt takes an interest in Nikolaj's education. Rosa rejects Amy's offer of a helping hand.

Amy and Jake hear conflicting stories as they investigate a sexual assault accusation. Holt refuses to believe an old nemesis is really dead.

After Gina makes a life-changing decision, she bestows a series of gifts on the squad. But first, an interpretive dance ...

A visitor from Latvia causes Charles and Jake to investigate Nikolaj's family. Holt and Amy bring in famed forensic scientist Dr. Yee to help close a case for Rosa.

Captain Holt and Amy manage an understaffed precinct. Jake and Charles investigate.

Charles enlists Jake's help in tracking down his son's favorite toy for Christmas, and the two find themselves accidentally facing off against a Latvian criminal ring as a result. Back at the precinct, the team gears up for their annual Christmas carol competition against their sworn enemy: the MTA.

Jake and Rosa tackle a case of a missing laptop on the set of a long-running TV police procedural. Terry’s vengeful ex takes over the audit.

Jake and Gina attend their 20th high school reunion. Back at the Nine-Nine, Charles helps Rosa with her love life.

As Jake struggles with his first case back at the precinct, he encounters Jess Day, who is visiting New York, and enlists her to help him find his suspect. Meanwhile, Holt researches ways to increase office morale and Amy tries to figure out why Rosa keeps taking such long breaks. The crossover continues on New Girl S06E04 Homecoming (II).

The squad suspects an inside job when guns and cocaine connected to a notorious crime boss go missing from the Nine-Nine.

Due to low crime rates, Brooklyn decides to close one of its precincts. The future of the Nine-Nine depends on an audit conducted by Amy’s boring ex.

Jake and Rosa go on a search mission after a stressed-out Amy disappears on the day of her sergeant's exam. Gina inherits a Boyle family heirloom.

While celebrating their first anniversary, Jake and Amy realize they've had a communication breakdown over a major life decision.

Jake and Charles go on a stakeout that lasts way too long, and Terry writes a book for his daughters that angers Amy and Gina.

While looking into a break-in at Holt's mother's house, Jake discovers a secret she’s been keeping from her son. The squad remodels the break room.

Jake and Terry go undercover at a costume-packed fan convention when their favorite fantasy author reports his much-anticipated manuscript stolen.

A missing person case forces Jake to confront his issues with therapy. Holt invites Rosa and her new girlfriend to dinner. Terry overcompensates.

On his first task back in the field, Terry takes advice from Jake on controlling his emotions to infiltrate and bust a steroid trafficking ring.

Holt's nemesis heads the precinct inspection, while Terry readies for his vasectomy and Charles needs a date for his ex-wife's engagement party.

When the precinct goes into lockdown on Thanksgiving night, it's up to Jake to keep morale high, even as things spiral out of control.

Jake is determined to prove that he's not to blame for Holt's bad mood, and when Charles catches a notorious bank robber, nobody believes him.

Amy gears up to meet Jake's mother on his birthday, but the celebration takes an unexpected turn. New body cameras prove embarrassing for Boyle.

When famous author DC Parlov receives death threats, Jake and Terry take the case, so that Terry can meet his lifelong hero. Back at the precinct, Gina forces her way into the Boyle clan of cousins in an attempt to choose the location of the annual Boyle family vacation. Meanwhile, Holt's anger peaks when Amy chooses Kevin's side in their argument about a math puzzle.