In a high-security prison during the 1930s, Paul Edgecomb is a guard in the death row section, known as "the green mile." His daily routine, marked by interaction with prisoners and the vigilance of impending punishment, changes drastically when John Coffey arrives, a huge and intimidating African American man accused of murdering two girls. However, as Paul and his coworkers learn more about Coffey, they realize that his presence is more of a mystery.
Coffey, despite his fierce appearance, is a kind-hearted soul who possesses an extraordinary gift. Trapped in his cell, he reveals his true nature: a sensitive being who feels the pain of others and has the incredible ability to heal illnesses. Over time, Paul faces a collision between his duty and his growing conviction of Coffey's innocence, which leads him to question the justice system and life itself.
The special bond that forms between Paul and Coffey challenges not only the racial prejudices of the time but also the seemingly inevitable fate that awaits the prisoner. As events unfold, the heavy decisions that the characters must make force them to confront sacrifice, redemption, and the weight of guilt, all while navigating the dark path of life and death.