Enter Mac Wells, a cop whose legendary cool reserve masks a fierce loyalty to his colleagues and his city. As one of New York's elite undercover agents, he is part of a flagship anti-crime experiment that everyone wants to work. And at first glance, it seems to be doing just that -- crime is down; the citizens are happy. But strange and random acts of violence persist, in a pattern that no one can decipher. And when Mac accidentally tranqs his partner during a subway crime, he unwittingly stumbles upon a conspiracy that reaches to the highest echelons of the police department... and the government. Now Mac is forced to choose between his loyalty to his colleagues and his sense of justice -- and to figure out whom to trust before he becomes the next casualty of a tragic "accident."