When a new prisoner comes to the death row, the guards starts to notice that the innocent man possesses a certain gift to heal.

I would tell this story from the main characters point of view (and most other stories to that mater…) the Tom Hanks character.

After a guard is healed by touch by a new mentally disabled inmate on death row he suspects the inmate of having tried to help the victim after her attack instead of killing her himself he must now find a way to prove his innocence before the execution.

I would say that the inmate being African American and the period being pre civil rights movement is also important as it made the inmates conviction harder to argue against but not sure how to fit that into the logline and not sure it is necessary.

Hope this helps.