Balancing the responsibilities of a new house and the joys of a new romance, Dr. Katie LeClair is finally ready to start enjoying life. But danger arrives just as the town of Baxter, Michigan, is gearing up for its annual Halloween festival --- and once again, this doctor-turned-sleuth will have to unmask a killer in their midst. Trouble comes in threes this Halloween. Katie sees a new patient who has just been released from prison for a murder he says he didn’t commit. Inexplicably, the patient suddenly goes missing. And matters take an even more sinister turn when a college student who had been investigating Katie’s old murder case is found dead in the woods near Baxter.

Dr. Katie LeClair quickly gets to work in building a life for herself in Baxter, MI, and beyond reviving her love life, she also finds a pair of business partners in a team of father and son family practitioners. But that idyllic dream is immediately shattered when one of her patients is found dead. The death is ruled a suicide, and was a result of the medication Katie had prescribed. But she doesn't remember writing it. When a closer investigation reveals it was murder, Katie is catapulted into an off-the-books investigation that leads her down a dark path of past secrets. But someone is willing to kill to keep part of the town's history in the shadows, and Katie must race to find out who before it's too late.