Richard is a detective with the U. S. District Police Department. On Thanksgiving morning in 2003, Jennifer was found dead in the bathroom at home. There were no signs of a fight at the scene, and there were no obvious injuries on the body of the deceased. There was only a glass stained with the blood of the deceased. The forensic autopsy results showed that some kind of mutated virus had entered Jennifer's body, and there was also a pinhole in the neck of the deceased. Richard took the glass back to the police station, and the fingerprints on it were also verified to be that of her ex-husband, Jason Stewart, but Jason always They were all defending that he did not kill Jennifer, and the glass was not his. At this time, Richard's partner Mason also found a bloody glass in the trash can next to the police station that was exactly the same as the one in the deceased's home. Richard's boss Lister transferred Richard because there was not enough manpower in the administrative department. Strange things happened one after another. Mason disappeared for no reason. Jason suddenly admitted that he was the murderer. On the way to the court for sentencing, he had an accident and his whereabouts are unknown~ Five years later, the police department had no choice but to bring Richard back to continue investigating the case. Can the culprit be found?