In 2008, a nine-year-old girl goes missing on a council estate in the north of England. A frantic search ensues but no trace of her can be found, and within a few hours the police investigation takes on the scale of a murder enquiry. Appeals by the apparently grief-stricken mother, Karen Matthews, come to nothing, and yet the community, led by the indomitable Julie, stand by her and make extraordinary efforts of their own to find Shannon. (thetvdb.com)