Missing (2009)

When a sixteen-year-old girl goes missing, her parents claim it is completely out of character, and are distraught when DS MJ Croft, head of the Dover Missing Persons Unit, finds vodka in the teenager's bedroom. DC Jason Doyle, however, is suspicious that the father is abusing his daughter. Meanwhile, Amy helps 65-year-old Stan Marsh search for his long-lost twin brother.