What is the main conflict in The Chamber by John Grisham?

The Chamber is a novel about redemption. Sam Cayhall is involved in a bombing and, after being convicted by a jury, lives in Parchman Prison awaiting his execution. At the time of the bombing, Sam is a member of the Ku Klux Klan. His family had been members for many generations and membership in the organization was part of his upbringing. Sam had also been involved in other crimes for which he had not been prosecuted. He and his brothers had participated in lynchings and he had murdered three men. At the time of his sentencing, Sam believes that his actions were acceptable. Over time, he develops remorse.