On her way to attend a Halloween Ball, Kay Driscoll, a newcomer to town, witnesses the murder of a local professor. When the official coroner's report rules the cause of death to be accidental and the community accepts the judgement, Kay decides to uncover the truth for herself. Through her personal investigations, Kay exposes a complex conspiracy, woven deep within the thriving local ginseng industry, that involves some of the more prominent figures and families of Sudbury Falls. With her new friends, the free-spirited herbalist Deirdre and the untamed modern woman Elizabeth, Kay discusses new clues over tea and pastries at Sweet Marissa's Patisserie, their crime-fighting headquarters. As Kay gets closer to the heart of the conspiracy, additional murders happen in quick succession. Before long, Kay learns that the villains are gunning for her, too. Phil, her musically talented but preoccupied husband, determined to keep her safe, withholds from her the one thing she needs most: the truth.