One of Williamson's ten top novels about deranged killers, as shared at the Guardian:
Paris Trout by Pete Dexter (1988)Read about another entry on the list.
The titular character of Dexter’s novel is a respected white businessman in Georgia after the second world war, who murders a 14-year-old black girl. The book is made up of his descent into murderous madness and the deterioration of his relationships with his wife and the members of the community. It ends in a blaze of violence that leaves the reader exhausted.