A new hunt for the Zodiac Killer gains unprecedented access to files, unearthing a complicated cypher that may contain the killer’s name, and links between the killer and an unsolved case.
Did the Zodiac Killer serve in the U.S. Armed Forces? The team’s supercomputer identifies strange symbols in the killer’s code that would have been known to only a few when it was written.
A new cipher is uncovered, while the team’s supercomputer uncovers a strange lunar pattern linking the killings. A taunting riddle by the killer may lead to a body. A second prime suspect emerges.
The FBI releases secret files 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.