S1 E1 ∙ The New Suspect ∙
As investigators revisit the case of California's Zodiac Killer, who was active in the late 1960s and early 1970s, a prime suspect with code training emerges.
G
Contains Mature Themes
As investigators revisit the case of California's Zodiac Killer, a suspect with code training emerges.
The hunt uncovers clues that the Zodiac Killer may have served in the US Armed Force.
A mysterious new cipher related to the Zodiac Killer is discovered.
A handwriting analyst studying the Zodiac Killer's letters makes a startling connection.
A team member solves the Zodiac's infamous Z340 code.