Edgecomb’s tour of duty at Cold Mountain in the Depression-era South included watch over a quartet of killers awaiting their final walk down "the Green Mile," the stretch of green linoleum flooring that took convicts from their jail cells to the electric chair.

Over the years, Edgecomb walked the mile with a variety of cons. He had never before encountered someone like John Coffey, a massive black man convicted of brutally killing a pair of nine-year-old sisters. Coffey certainly had the size and strength to kill anyone, but his demeanor starkly contrasted with his appearance. Beyond his simple, naive nature and a deathly fear of the dark, Coffey seemed to possess a prodigious, supernatural gift. Edgecomb began to question whether Coffey was truly guilty of murdering the two girls.