An innocent bike ride on Nantucket leads Detective Nia D'Amato to a quiet street where painful cries erupt from a nearby backyard. She discovers a mother and daughter pinned beneath a fallen dead tree. Firemen arrive working frantically to free them and Nia later discovers evidence of likely sabotage.

Against the advice of her Deputy commander back in Boston, she teams up with Captain John Miller, the local police chief. Together they follow a trail of old secrets and clandestine relationships complicated by the volatile passions of impulsive teenagers. Solving one mystery only plunges them into another: the seemingly innocent death of a girl thirty years earlier. Nia and Captain Miller race to uncover the clues and find a piece of critical evidence before it's destroyed.