S1, E1: 2006. Tony and Emily Hughes’ life changes forever when their 5 year-old son Oliver goes missing on a family holiday to France. A huge manhunt led by Julien Baptiste, one of France’s finest detectives, is launched. Present day. Eight years on from Oliver’s disappearance and the fallout has resulted in the end of Tony and Emily’s marriage. Tony refuses to believe that Oliver is dead and doggedly continues his search to find his son.