«No Good Deed Left Undone» by Ginny Fite

A West Virginia cop investigates the murder of a philanthropic philanderer in this mystery by the author of Cromwell’s Folly.
A detective with West Virginia’s Bureau of Criminal Investigations, Sam Lagarde appreciates a good horseback ride now and then to clear his thoughts. He keeps two horses of his own and finds their companionship to be more reliable than any of his previous marriages. And now his knowledge of horses may come in handy on his current case . . .
Wealthy Grant Wodehouse is found pinned to his stable with a pitchfork through his chest. Lagarde’s certain it was a crime of passion. The trouble is Wodehouse had plenty of enemies: women he’d slept with, their husbands, people he’d swindled in business dealings, and even his own children. 
To discover who murdered Wodehouse, Lagarde must first narrow his list of suspects. Unfortunately, the killer is all too willing to help.
Praise for Cromwell’s Folly
“[Ginny Fite] has no trouble delving into the dark side of people and showing us that evil exists.” —Katherine Cobb, author of Break Out the Dawn“Not your ordinary murder mystery! . . . I couldn’t put it down.” —Tonya Royston, author of Surrender at Sundown