John Coffey arrives at Cold Mountain Penitentiary ready to walk "The Green Mile" for the murder of the twin girls under his protection. Prison Guard Paul Edgecombe has a duty to ensure even the most psychopathic of murderers such as Billy "The Kid" Wharton journey along the mile towards the electric chair is a peaceful one. Why then does Paul start to doubt Coffey's guilt and what does Coffey mean when he says, "I tried to take it back but it was too late"?