Forensic expert Ava Black possesses the ability to “see” a victim’s final moments through their blood samples. When the evidence box from a 20-year-old serial killer case resurfaces, she discovers that the killer never stopped—and their methods match recent crimes. As the investigation deepens, Ava realizes that the killer has been waiting for her to reopen the case, and she has become the next target. With the help of her partner, Jack Morrison, she must use her unique ability to uncover the truth and stop the killer from striking again. But the truth is far more terrifying than she imagined—the killer not only knows of her existence but also knows her secret. A deadly game of cat and mouse is about to begin, and Ava must confront a harsh reality: some memories, once awakened, can never be forgotten.