Called in to recover evidence in the aftermath of a horrific explosion on a New Orleans ferry, Federal agent Doug Carlin gets pulled away from the scene and taken to a top-secret government lab that uses a time-shifting surveillance device to help prevent crime.
The true story of the investigation of the “Zodiac Killer”, a serial killer who terrified the San Francisco Bay Area, taunting police with his ciphers and letters. The case becomes an obsession for three men as their lives and careers are built and destroyed by the endless trail of clues.
