The Field on Oakwood Farm by Danielle Stewart

The success of solving a cold case on East Bonnet Beach catapults Gwen and Mark into the limelight. Their approach, current popularity, and connections make the lure of another long forgotten Jane Doe impossible to avoid.
Morristown is a small farming town in Connecticut. Friendly neighbors. Helping hands. Bright smiles. But for some reason, no one seems to care at all about finding the person who murdered a stranger and buried her in their town.
The reputation of a dead man, a town hero, is more important than justice in their eyes.
An odd family vacation, Gwen and Mark load up the car with the people they love and head to Oakwood Farm. Determined to break the decades old complacency of the locals, they realize quickly just how dangerous that might be.