11-year old Kyle Heath escapes a couple claiming to be social workers who try to force him into their car but next day his mother Katy tells Banks and Helen that they returned and abducted him and the phone number they gave her is false. Mr and Mrs Harris who live opposite confirm the visit but are critical of Katy's parenting and Kyle's behaviour. When heroin is found in the floor-boards of Katy's house Annie believes Kyle was taken to force Katy to give them to the abductors but Katy denies knowledge of it. She suggests Kyle's father, her estranged partner Paul Cain, is the culprit though evidence suggests that Kyle is the actual drug dealer, earning money to spend at an arcade with headmaster Mark Campbell. Then a young boy's corpse is found - though it is not that of Kyle.