A severed finger leads to a horrifying kidnapping and extortion case! Beauty product salesman Xiao Youlan’s finger is cut off and used to extort 50 million dollars from his son. The forensics team must race against time, searching for clues as to who the murder may be. The police suspect that a doctor who researches beauty products was unhappy because his formulas were changed, leaving his son with a strong motive for crime. It is also found that the son is strongly suspected of having arranged his own mother’s kidnapping. The next day, the doctor is shockingly killed in the clinic. The evidence shows that the killer comes from a specialist medical background. Who could it be?