Zhen Zhen was convinced Wu Jia had to be Zhang Shanshan, so she immediately assigned people to keep an eye on Zhang Shanshan. At the same time, she sent others to search the places Zhang Sicheng had been before he died, looking for anything that could be used to check DNA.
She wanted to confirm whether the DNA Bai Xiaofu had been investigating before her death matched Zhang Sicheng's.
After all, if Zhang Sicheng really had killed Bai Xiaofu, then she must have threatened him.
But Bai Xiaofu had been Zhang Sicheng's wife, and they had a child together. What could possibly have made Zhang Sicheng feel he had to kill her?
Zhen Zhen soon learned that shortly before her death, Bai Xiaofu had apparently been asked by Old Lü from the Evidence Examination Department to check the DNA left under a victim's fingernails.
Zhen Zhen believed this DNA was the key to the whole case.
Captain Lu knew about the investigation Zhen Zhen had arranged, but he thought this kind of big-data approach to solving cases was absurd. Still, Zhen Zhen was his direct superior, and even Lin Hao, the bureau chief, supported her. He had no choice but to grudgingly accept her investigation.
So Captain Lu had never taken Zhen Zhen's investigation seriously. He thought that, as a rising star in criminal investigation, she was bound to be an academic type, with too much theory and far too little experience.
He had even started doubting the cases Zhen Zhen had handled in the past.
But he was soon proved wrong. When the results of Zhen Zhen's investigation came in, Captain Lu had no choice but to take it seriously.
After all, by using big data, Zhen Zhen had actually found a highly suspicious culprit.
When a veteran detective