After weeks of working one gruelling drug case, Jake finally gets a lead that can get him to one of the biggest suppliers in the city. However when the bust goes sideways, Jake ends up disappearing into thin air, his badge and gun discarded on the road and his radio smashed into thousands of pieces.
After a year of searching, the nine-nine are still unable to find the missing detective and Amy, as well as the other detectives on that case, start to believe he's dead.
By some miracle, however, one year after the detective goes missing, he shows up randomly in the precinct to report a crime. The one problem, he doesn't recognise the building or anyone inside of it. He doesn't even recognise his own name.
(Cross-posted on AO3 under the same name)
So in the Brooklyn Nine-Nine episode titled "Show Me Going" (5x20), Rosa goes to help other officers take down some shooters in Brooklyn Heights. The episode never shows the situation, only the squad's concern for Rosa back at the precinct. I've always wondered what happened exactly because Rosa avoids talking about it at the end of the episode. So I decided to write it myself! Obviously, the characters do not belong to me. I created a couple of characters just for the plot, and some of them are mentioned in the original episode's script (it'll make sense, trust me).
!!!!!!! TW: guns, shooting, fistfights, profanity !!!!!!!