Sunday 2 September, 9pm, BBC One
Coming Down the Mountain is the first TV drama written by award-winning novelist, Mark Haddon (The Curious Incident of the Dog in the Night-Time).
Teenager David (Nicholas Hoult ? Skins, About a Boy) falls in love for the first time and life couldn't be better. The only fly in the ointment is his 17-year-old brother, Ben (Tommy Jessop), who has Down's syndrome.
The family's world revolves around Ben's needs while David's are unwittingly neglected by their parents (Neil Dudgeon ? Sorted, The Street - and Julia Ford ? All About George, In a Land of Plenty).
They decide to move the family from London to "the back of beyond" for the sake of Ben's education. David loses love, friends and his school. His antipathy to Ben grows and grows to the point where he decides to push him off a mountain and get rid of him once and for all...
The drama takes the two boys on a journey to the dangerous and strange wilderness of Snowdonia.
Mark Haddon says, "I began writing Coming Down the Mountain with the idea of creating a meaty role for a young actor with Down?s syndrome. It ended up as a film about the stuff of every teenager's life ? love, sex, anxiety, ice-cream, parties and nipple-rings."