On September 27, 1969, a young woman named Cecelia Shepard died while being rushed to the hospital after she and fellow student Bryan Hartnell were viciously stabbed as they picnicked along an isthmus on a beautiful day at Lake Berryessa in Northern California. But before succumbing to her injuries, she provided a detailed description of a man dressed in a black executioner's hood who carried a gun and a foot-long knife. This was the face of evil. This was the Zodiac. But despite one of the largest manhunts in American history, his identity remains unknown. Or does it?