Duenna to a Murder - Rufus King

Melissa Tyler, who had just inherited incredible wealth, came to the Harden Detective Agency claiming she needed protection from crank letters and any possible trouble involving her family. This was a vast understatement of the situation as Margot, the poised young woman from Harden's, learned when she returned with Melissa to a languorous South Carolina town.
In a town dominated by conservative old families, Mrs. Tyler's husband was unique. A former carnival knife thrower covered with tattoos, he presented a fantastic social problem. To make things more desperate, his daughter—on the verge of a concert debut —jilted one of the town's favorite sons...and showed marked interest in a handsome, somewhat sinister, newcomer.
The situation became literally deadly when the body of a murdered man was found in the driveway of the Tyler home—and what had been scandal grew into horror!