Three years since the massacre at Sablefall Farm and life has slowly returned to normal in the small North Yorkshire town. Elaine Davis secretly harbours mass murderer Harper Darmody and the siblings exact brutal revenge to those responsible for their childhood trauma. Their retribution, however, does not go smoothly and DCI Harry Baxendale is closing in.
Elaine employs Lenny Grey, a former investigative reporter to track down the man responsible for killing her son eight years previous. When his old friend DCI Colin Hargreaves reaches out following the discovery of two young boys pulled from a small body of water, they suspect it's the work of the same killer. It soon becomes clear they are dealing with something far more sinister than they could have imagined.
With another young boy missing and events taking a dark turn, Elaine, Harper, Lenny, and Tom form an unlikely alliance to stop the depraved child killer.