2006. Tony and Emily Hughes' life changes forever when their five-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. The French police face an uphill struggle in their mission to find the young boy - Oliver seems to have disappeared into thin air. Tony and Emily are in a foreign land - they do not speak the language and do not understand the rules. As their desperation and the profile of the case grows, Tony and Emily find themselves thrown into a media maelstrom, learning the hard way that not everyone they meet is willing to operate in their best interests. Present day. Eight years on from Oliver's disappearance, 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. After years of searching, Tony is given new hope when a shred of evidence emerges. This reignites the interest of Julien Baptiste, the lead French detective at the time of the disappearance, who returns to Chalons Du Bois to try and finally get to the bottom of what happened to Oliver Hughes.

2006: Three days since Oliver's disappearance, and with little information to go on, suspicion immediately falls on a known paedophile living in the area. With police protocol keeping Tony and Emily firmly in the dark, Tony is tempted when ambitious journalist, Malik Suri, comes forward with illegally obtained information on the suspect in custody. Then the suspect is released with a seemingly concrete alibi. A generous benefactor reaches out to Tony and Emily when they are at their lowest ebb, offering a financial reward for anyone coming forward with information relating to Oliver's disappearance. Present day: Tony's attempt to reopen the investigation gathers momentum as he and Julien finally find the first bit of solid evidence. While Tony continues on his mission to find out the truth about what exactly happened to his son, both Emily and Julien have to deal with problems in their own lives.

Progress into the case is initially slow but a shocking new lead emerges.

The stress of the reopening of the case takes a toll on Emily and Mark's relationship.

In 2006, Tony and Emily's pleas to reinvestigate a suspect again fall on deaf ears.

In the present day, Tony and Julien make a breakthrough.

Tony and Emily return to Chalons du Bois and their relationship thaws.

The truth about Oliver's disappearance finally comes to light.