When her former boss is killed by unknown assassins, Treasury agent Marybeth Medina (Cynthia Addai-Robinson) is forced to contact Christian Wolff (Affleck) to solve the murder. With the help of his estranged but highly deadly brother Brax (Jon Bernthal), Chris uses his brilliant mind and less-than-legal methods to piece together the unsolved puzzle. As they get closer to the truth, the trio attract the attention of some of the world's most ruthless killers, all determined to put an end to their search.