Six Four is a dark and compelling story of kidnap, corruption, betrayal and an uncompromising search for the truth, when Chris and Michelle O'Neill's teenage daughter goes missing.Serving police detective, Chris is provided with a startling revelation about an infamous, unsolved case that once divided the police when a local girl called Julie Mackie disappeared. Now, reeling from the news that his own daughter has gone missing, Chris is approached by a journalist who tells him that fatal mistakes were covered-up in Julie's disappearance. Revisiting the case, Chris uncovers a series of undeniable errors, corruption and unbridled ambition.