First broadcast 29th/30th October 2008.<br /><br />The half-naked corpse of a twelve-year-old boy is found in his school grounds and Liam, the child in whose company he was last seen, has disappeared.<br /><br />Emilia Fox - Dr. Nikki Alexander<br />Tom Ward - Dr. Harry Cunningham<br />William Gaminara - Professor Leo Dalton<br />Krishan Naidoo - Michael Edwards<br />Jack Pollock - Liam<br />Reece Dinsdale - Noel Hopkins<br />Georgia Box - Schoolgirl<br />Barry Ewart - Caretaker Smythe<br />Daniel Hill - Roger Lewis<br />Conor Quilty - Cheeky Scholboy<br />Penny Layden - Det. Inspector Gallagher<br />Michael Begley - Danny Edwards<br />Emilio Doorgasingh - Nilish Bhardwaj<br />Abigail Davies - Family Liason Officer<br />Fiona Wade - Anhil Edwards<br />Alan Williams - Eddie Stokes<br />Peter Guinness - Powell<br />Andrew Westfield - Foreman<br />Janet Walker - Teacher<br />Daniel Hill - Roger Lewis<br />Chris Wilson - Police Officer
