Charlie Shackleton was making a true crime documentary—a riveting account of a highway patrolman's effort to capture the Zodiac Killer. Shackleton devised a plan, began collecting interviews, and shot “evocative B-roll” footage. And then the project fell apart. ZODIAC KILLER PROJECT emerges from the ash heap to probe and deconstruct the form with the incisive eye of a true crime connoisseur.