The only clue that could be used was an exquisite card left at the location where the body was found.
It contained clues about the Poincare Conjecture.
Qin Luoshu joined the discussion, "If the hint isn't accidental, then it means the criminal really is capable of committing serial killings."
"The Poincare Conjecture, besides being one of the seven great mathematical problems of the world, actually has quite a bit of controversy surrounding it, with the path to its proof taking a hundred years. We can't put all our clues on it," someone else chimed in.
The police did not particularly avoid discussing in front of Jiang Beiyu; in fact, their discussion was only about whether the conjecture could serve as a clue.
Everyone was speaking at once, causing such a commotion that even the boss, Feng, had a headache.
It wasn't until Jiang Beiyu, the free laborer, piped up with a question, "Excuse me for asking, but do you mind telling me how the victim died?"
