The worst monsters are human. Six months ago, Nathan's sister was brutally murdered. Keywords: new adult, vigilante justice, crime fiction, psychological thriller, kidnapping crime fiction, crime thriller, vengeful mystery series, international crime, terrorism, counter-terrorism, dark kidnapping romance, abduction, recovery after rape, post traumatic stress disorder, PTSD, Western Australia, free psychological thriller mystery and suspense, kidnapped romance, vigilante justice series, free terrorism thrillers, psychological thriller romance