21 Bridges focuses on a discredited NYPD detective. When a city-wide manhunt is launched for a police killer man, the detective has a chance to redeem himself. After a while, the police begin to uncover a conspiracy that links their colleagues to a criminal empire. As the hours go on, it becomes uncertain who he follows and who follows him. As the search intensifies, extreme measures are being taken to prevent the killer from escaping from Manhattan. Authorities are also blocking 17 bridges to block entry and exit to the island. The iconic island of Manhattan is disconnected from the outside world for the first time in history.