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.

On the night before the wedding, Nick and Winston try to help Schmidt re-write his vows and Jess, thinking that Sam is going to propose to her, rallies the gang into playing True American to avoid giving him an answer.

Schmidt makes a last ditch effort to convince Cece's mom to come to their wedding, but in doing so, he might miss the special day himself.

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).