You read a piece of news in the newspaper.
The content of the message is probably that a dying rich man organized a decryption party and invited all detectives or mystery enthusiasts in the world to participate. The person who finally successfully decrypted the decryption can get her inheritance.
You participated in this game, only to find that this game seemed to be related to a case you knew about...
Food tips:
This is a pit I made before, but I changed my mind.
Second person detective mystery.
Updating from time to time
Purpose: Make money reasonably and legally, be patriotic and abide by the law