Fitz receives linguistic proof that Ted is the Unabomber and tracks down Ted's brother David, who is astonished at the accuracy of Fitz's profile.

FBI profiler Jim Fitzgerald is under the gun to amass the evidence needed to secure a search warrant for Ted Kaczynski's cabin. Why the extreme sense of urgency? Because the plan was originally for a small surveillance team on the ground in Montana to build a case for a warrant over months, but after CBS News learns that the Unabomber has been identified, the FBI has just 24 hours until the network reports it. Now it's up to Fitz to find a linguistic "smoking gun" that will tie Kaczynski to the Manifesto in the eyes of a Federal judge.