On the night of the Summer Solstice in '99, nine-year-old Roisin O’Halloran marched into the Hanging Woods, the mysterious copse that had inspired fear in decades of children in the small Irish town of Bannakilduf. She was never seen again. Twenty years later, two women are drawn together to discover the truth of what happened to Roisin: Roisin’s older sister Deedee and Roisin’s childhood best friend Caitlin. Reluctantly brought together after decades of mistrust, Caitlin and Deedee must reckon with their shadowy pasts, the monsters that still haunt them and the role they each may have played in Roisin’s disappearance. With old wounds made fresh, the unresolved events of that summer years ago rise to the surface and the truth threatens to reshape the small town that would prefer the past remain buried.