Harlee Santos is a detective at the heart of a tight-knit crew of Brooklyn cops lead by Lieutenant Matt Wozniak. The crew often steps outside the law to protect their precinct and their own. When Loman, the newest member of the team, kills an unarmed man, Harlee covers it up. As a big illegal job for the team looms on the horizon, FBI Agent Stahl arrests Harlee and leverages her daughter in order to turn her into an informant.