Photo: Murray Close/Lionsgate Stephen King wasn’t much older than the teenage characters he was writing about when he started working on The Long Walk , which explains why the novel, eventually published under the pen name Richard Bachman in 1979, fits a young-adult context as much as it does horror. The Long Walk , a movie version of which is finally arriving in theaters after decades of failed attempts by the likes of George A. Romero and Frank Darabont, is about a totalitarian regime putting