Jake and Amy go on their honeymoon, and Captain Holt finds out whether he is the new commissioner of the NYPD.

Jake and Amy's wedding day is threatened; Charles and the whole squad rush to save it; Holt hesitates to open the email indicating if he won his campaign for commissioner; Terry gently pushes Rosa toward a potential love interest.

Diaz and Santiago team up to take down a ruthless killer who has managed to elude them for seven years. Jeffords helps Peralta with wedding duties. Captain Holt and his rival Olivia Crawford try to convince each other to step down from the campaign.

Rosa responds to an active shooter alert; the rest of the squad is forced to stay back; Jake frantically brainstorms ways to offer his assistance; Terry faces an existential crisis; Gina and Amy try to be useful by fixing Rosa's broken toilet.

For Jake's bachelor party celebrations, Charles decides to plan an elaborate scavenger hunt, but the day goes awry when the guys decide to take short cuts instead; Amy's bachelorette party escalates when a secret affair is revealed.

When a fire destroys Charles' food truck, Pimento unexpectedly shows up to the scene as the insurance agent; Rosa helps Amy to see that it's okay to get excited about picking her wedding dress; Gina and Terry coach Holt in the art of social media

Peralta invites his newly discovered half-sister Kate to come and stay with him in New York, but he and Santiago soon realise she is a bit of a nightmare. They have to quickly come up with a way to get her home.

Jake and Charles get tied up in a pyramid scheme and must find a way to sever their contracts. Jake invites his new half sister to stay with him in New York until he finds out that she is a nightmare.

Jake surprises Amy with an investigation into arson cases connected to her favourite crossword puzzle author, Gina helps Holt jazz up his commissioner candidate speech and Terry, Rosa, Hitchcock and Scully argue over who deserves the detective car.

Captain Holt sacrifices an evening at the opera to help Peralta carry out an interrogation in the hope of getting a confession from a stubborn suspect.