In Boston, the violence of El Salvadorian gang MS13 is spreading; special agent Jeff Wood is the head of the FBI's North Shore Gang Taskforce and faces a battle of wits and wills to put an end to MS13's violence in his city.

The FBI races to track down the polished young woman on a multi-million-dollar jewelry store robbery spree spanning five states; if they can bring her down, agents hope she'll cooperate and reveal the full extent of the gang operating behind her.