An overabundance of Chinese food take-out menus left at the loft’s front door is the catalyst for an interconnected series of adventures for Jess and the guys.

Jess' wild-child sister, Abby, pays a visit and immediately throws the loft into disarray. Meanwhile, Schmidt enlists Nick to be his wingman in crashing a bar mitzvah and Winston throws a dinner party with Bertie, which turns awkward when only Cece and Coach attend.

Schmidt tutors Jess in the not-so-fine-art of dating via mobile apps. Meanwhile, Winston is desperate to make a good impression on his fellow police cadets, which backfires when Nick, Coach and Cece show up at a party thrown by fellow officers.

As the gang prepares to depart for the holidays, they quickly find they may be home alone when they are all trapped at the airport.

Jess crashes a funeral, hoping to delete a “sext” she recently sent to the deceased. Then, Schmidt’s mom, Louise, arrives in town for a visit to demand he write thank-you notes for his bar mitzvah gifts, and Winston is desperate to be off-duty friends with his police partner, Aly.

Jumping back into the dating pool, Jess finds herself dating a dud (guest star Taran Killam), but falls in love with his perfect parents (guest stars Henry Winkler and Julie Haggerty). Meanwhile, Nick (Jake Johnson) and Schmidt have very different ideas about how to run the bar.

Things heat up between Nick and Reagan over who can provide the loft with the best air conditioning unit. Meanwhile, Winston uses his “cop voice” to help Schmidt prep Cece for a newscaster audition.

Jess and the gang head to New York, where Schmidt believes he is being honored at his high school. Jess meets Det. Jake Peralta and helps him on a case, which leads her to Brooklyn’s 99th Precinct and a fateful encounter with Gina Linetti and Capt. Raymond Holt. Meanwhile, Nick and Winston scramble to make subway fare, while trying to impress Det. Charles Boyle, and Cece faces off with her new mother-in-law.

The crossover starts on Brooklyn Nine-Nine S04E04 The Night Shift (I).