This new two-part drama starring Sheridan Smith is based on the infamous true story of when nine-year-old Shannon Matthews went missing from Moorside Estate in Dewsbury in 2008. In tonight's opening episode, the family launch a public appeal while the community rally around to help, but nothing shows up. However, doubts begin to creep in for some regarding her mum Karen's behaviour, and friend and neighbour Natalie Brown struggles with her conscience as she becomes convinced that Karen knows more than she is revealing, and as people who remember that news story will know, she definitely does.