A Light in the Shadow by Douglas V. Gibbs

Private Detective Damon Mathews must battle his tormented past as he investigates bizarre events plaguing the town of Roseboro, Arkansas. The alleged madness of Sara Parkeson eventually leads Damon to her red rose garden where secrets behind a toppled tombstone in the cemetery, and a rash of other bizarre occurrences rocking the town of Roseboro, are revealed.

And over an old tree stump, down the third row of roses in Sara's red rose garden, lies a truth that even he didn't expect.