After a mass shooting at a police funeral, reclusive ex-cop Gannon (James Badge Dale, The Pacific, 13 Hours) finds himself forced out of retirement when he realizes that the killer belongs to the same militia he joined after quitting the force. Realizing the shooting could set off a chain reaction of copycat violence, Gannon quarantines his fellow militiamen and begins a series of grueling interrogations, intent on ferreting out the killer. 1 ½ hrs, 1 DVD or Blu-ray disc, SDH. Mature audiences.