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The psychological toll of Jodi Goodwin's double life as an undercover investigator begins to surface after a mass shooting hits close to home.

An extremist’s arrest sparks talk of retaliation, so Jodi delves into his network before a doxxing escalates into a deadly situation.

Jodi uncovers the identity of an online extremist leader but inches closer to crossing the line between observation and engagement.

Charlie comes home from Iraq on leave, while Jodi is forced to relive her harrowing military experience to persuade a skeptical target.