The Hunt for the Zodiac Killer

A new hunt for the mysterious Zodiac Killer gains unprecedented access to files, unearthing a complicated cypher that may contain the killer's name.

The hunt uncovers clues that the Zodiac Killer may have served in the U.S. Armed Forces, as the team's supercomputer identifies strange symbols.

A taunting riddle by the killer may lead to a body. A second prime suspect emerges.

The hunt goes into high-gear as the FBI releases secret files on the mysterious Zodiac Killer.

Sal and Ken investigate San Francisco, the epicenter of the Zodiac Killer murders, as the Code Team announces extraordinary news