Fallen From Grace, by J. R. Lindermuth
As the 19th century winds to a close, Sheriff Sylvester Tilghman of the small Pennsylvania town of Arahpot ponders his biggest problems: finding a new deputy and convincing his true love, Lydia, to marry him. But an early autumn day finds Arahpot’s usual tranquility shaken when a stranger is fatally stabbed.
Suddenly Sylvester is plunged into investigating two murders. As he works through an abundance of suspects, Tilghman finds himself in danger. And worse -- Lydia is pushing her obnoxious cousin as a candidate for deputy.