When a rapist is found mutilated in a brutal attack, Detective Kim Stone and her team are called in to bring a swift resolution. But, as more vengeful killings come to light, it soon becomes clear that there is someone far more sinister at work. With the investigation quickly gathering momentum, Kim finds herself exposed to great danger and in the sights of a lethal individual undertaking their own twisted experiment. Up against a sociopath who seems to know her every weakness, each move she makes could be deadly. As the body count starts to mount, Kim will have to dig deep to stop the killing. And this time—it's personal.