Season 1, Episode 4
The Secret FBI Files
Air Date: 2017-12-05
Overview: The hunt goes into high-gear as the FBI releases secret files on the mysterious Zodiac Killer, and a handwriting analyst connects the Zodiac’s letters to a taunting letter mailed 3,000 miles away in Albany, NY. The code team has a massive breakthrough on the Z-340.
Runtime: 50 minutes
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