The Middleman by Olin Steinhauer

A subversive group starts making its members vanish one by one until hundreds are missing without a trace and then the violence begins. For Special Agent Rachel Proulx this is just the beginning of the journey down the rabbit hole. Her life has taken some turns and now she must decipher where these people are and if it is indeed the work of Martin Bishop and his radical Massive Brigade or is it part of a much larger organization. Trying to be one step ahead and knowing who she can trust only deepens the mystery. This timely cat-and-mouse thriller will keep you on the edge of your seat and questioning the evening news. It is like binge-watching "Homeland" or "Mr. Robot".