While on a trip to visit her grandfather, an attractive mother and two of her children mysteriously disappear. This leads to a desperate search to find them before it's too late.

Matt learns the shocking news that his missing wife, Leanne, is pregnant while attending a press conference organized by press officer Defne Topcu; Hazel is suspicious that her son Kyle may have been involved with the abduction and makes a call to the police; a major breakthrough happens when the flower seller is located.

With the investigation in it’s fourth week, Matt become further estranged from Leanne’s parents in part because he gives an interview with a TV crew and also because of the constant presence of Sarah Wheeler in his life. Tanya and her estranged father attend a local fair which ends with a grisly discovery.

The discovery of a burnt out van offers some new evidence to Barclay's investigation, as the suspect slips away; Matt joins Gary with the police, in a stakeout at the home of Hazel Betts; Amy celebrates her retirement with a party at a pub; several new clues bring Barclay and his team close to solving the case.