Six months after apprehending methodical killer Sage Wellington, FBI Agent Sidney Stone receives mysterious DNA test results revealing a half-sister she never knew existed – just as a series of deaths bearing Wellington's distinctive signature begin to surface, forcing Sidney to confront the possibility that her newfound family connection may be hiding deadly secrets.When a package containing DNA test results arrives unexpectedly at Sidney Stone's desk, the discovery of a half-sister should be cause for celebration. Instead, it marks the beginning of a dangerous game.As Sidney investigates her connection to her half-sister, forensic psychologist Naomi White, a chilling series of "accidental" deaths echoing Sage Wellington's methodology demands her attention. The victims share a disturbing pattern – all dismissed trauma victims' experiences. With each new death, evidence increasingly points toward Naomi, whose professional expertise mirrors Sidney's own unsettling ability to understand killers.As Sidney searches for her long-absent father for answers, she must determine whether Naomi is a fellow pawn in someone's elaborate scheme or the mastermind herself. Family ties have never been more dangerous, and Sidney's intuition – the very skill that makes her exceptional – may be clouded by a longing for connection she's denied herself since childhood.