Natchez Burning by Greg Iles

This is a long historical fiction novel on the topic of race-related crimes in 1960's Natchez, Mississippi. The "bad guys" in this story are a group of killers who broke away from the KKK to commit their own heinous crimes against blacks.  The "good guys" in this story are Penn Cage, the city mayor, and his father Tom, a beloved doctor in the community.  There is also a white reporter named Henry who has been collecting evidence against the bad guys for years with the intention of bringing them to justice.  This book is over 800 pages and it contains a great deal of violence, so it's not for the faint of heart.  It is, however, well-written and kept my attention throughout.  There's a follow-up novel called The Bone Tree which I may read in the future.