The season of approaching darkness, Nos Galan Gaeaf, begins with the harvest and the traditions of magic that haunt the hills and valleys of North Wales. This mysticism is strong in the village of Llangynog, where visitors gather for the faire, for the bonfire, and for the hope of seeing something that has crossed between worlds. Llangynog is a thin place, a place of old magic where community spirit thrives and the mysticism of ancient times lingers on. This year, screams shatter the fun of the community celebration, and the magic evaporates when DCI Will Cooper is tasked with investigations into both a murder and a kidnapping. With a promotion on the line and the child at risk, he scrambles to utilize the resources he has at local constables and worried community members, but no superior officer to direct his efforts. Sorting through suspects isn’t easy, but Will is determined to both prove himself capable and to find the lost child, to earn the promotion he knows will cement him to the community he’s grown to love.