<Tr> <Td_colspan="2"> ← Previous Season 4 </Td> </Tr> <Tr> <Td_colspan="2"> List of Brooklyn Nine - Nine episodes </Td> </Tr> <P> The fifth season of the television sitcom Brooklyn Nine - Nine premiered September 26, 2017 on Fox . </P> <P> Jake and Rosa adjust to life in jail before the Nine - Nine are able to bust Melanie Hawkins when Holt is forced to make a deal with local mobster Seamus Murphy . After their release, Jake realizes he's not ready to be back out in the field right away and Rosa breaks up with Adrian . During the fifth annual Halloween heist, Jake proposes to Amy and they get engaged . On a trip to Los Angeles for the funeral of the Nine - Nine's previous captain, Holt learns he's in the running to become the new police commissioner and the crew vows to help him deal with Murphy . Rosa comes out as bisexual . Gina returns to the Nine - Nine after spending months on maternity leave . Though the crew successfully finds a loophole that allows Holt to keep up his deal with Murphy without jeopardizing his moral code, Murphy finds out about their ruse and threatens Kevin's life . </P>

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