Inspired by the bestselling novel of the same name by Hideo Yokoyama, Six Four is a dark and compelling story of kidnap, corruption, betrayal and an uncompromising search for the truth.

The series follows Chris (Kevin McKidd, Grey's Anatomy, Trainspotting ) and Michelle (Vinette Robinson, Boiling Point, Sherlock) whose world is rocked when their daughter goes missing.

Michelle takes her skills as a former undercover officer and tries to get to the bottom of the case, while Chris, a serving police detective, is simultaneously confronted with a similar case of a local girl's disappearance that has gone unsolved. Will they manage to get to the bottom of this case, that also involves politics and extortion?