Detective Inspector Jack Caffery is a young man on a journey of self-discovery. Haunted by the belief that his neighbor killed his 10-year-old brother in the 1990s, Jack becomes fixated on correcting the injustices around him—though it comes at a significant price. Meanwhile, in a secluded residence in Monmouthshire, the affluent Anchor-Ferrers family falls prey to the twisted schemes of a psychopath, leaving them trapped and tormented. As these two storylines intersect, the result is a gripping, suspenseful, and profoundly unsettling race against time.