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.