After a bomb explosion devastates a residential apartment building, special agents Maggie Bell and Omar Adom "OA" Zidan of the New York office of the FBI investigate a possible war between rival gangs.
After a senator's daughter is kidnapped and held for ransom, the FBI must find the little girl before their time limit expires; they must dig into the senator's past for clues who did this to his family.
When a U.S. Marshal and a key witness are ambushed and murdered, Maggie and O.A. must find the person who leaked the information that led to their killings.
An illegal arms dealer who has turned informant gets assassinated; OA is the only agent that looks like him and assumes his identity, going undercover to stop the sale of more weapons.