<Tr> <Td_colspan="2"> ← Previous Season 3 Next → Season 5 </Td> </Tr> <Tr> <Td_colspan="2"> List of Brooklyn Nine - Nine episodes </Td> </Tr> <P> The fourth season of the television sitcom Brooklyn Nine - Nine premiered September 20, 2016 on Fox and ended May 23, 2017 with 22 episodes . </P> <P> Jake and Holt are placed in Florida as part of the witness protection program until the 9 - 9 helps them take down Figgis . The squad is subsequently punished by being placed on the night shift, but are put back on the day shift when Captain C.J. Stently is transferred from active duty for his incompetence . Charles and Genevieve adopt a son, Nikolaj . Adrian returns and resumes his romance with Rosa, but they call off their wedding and decide taking their time getting to know each other . Jake and Amy move in together after having a bet to see which of them can keep their apartment for catching the most escaped criminals . Gina gets hit by a bus and becomes pregnant with the child of a Boyle cousin, Milton . She also saves the precinct from getting shut down . Terry becomes a victim of racial profiling . Jake and Rosa compete for a spot on their idol Lt. Hawkins' task force, but Hawkins turns out to be a dirty cop and she frames them for bank robbery . They are found guilty and are each sentenced to 15 years in jail . </P>

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