The Key to Unlocking the Truth: the Urban Undercurrent Returner

At the age of twenty-five, Lu Xingyuan received an email signed "Returning Traveler". Click the link to enter the "World of Detectives". It read: "You will continue to discover the truth, and you will continue to discover - what it means to be a detective." There is a gift waiting for him, but it requires a password. He tried all the words, but nothing was right. He replied: "What's the password?" The other party said: "Go to Shaoxing. There are things there that can help you crack the code." There he went. Old Taimen, stone road, wet alley. On the first day he arrived, he squatted at the entrance of the alley, glanced at the marks on the ground, and said, "The cat took it away." When his grandma asked him what he did, he said, "Detective." A few days later, Uncle Chen fell down the stairs and died. He squatted at the top of the stairs and felt for an hour - the tenon at the end of the handrail was loose. The case was solved. On the third day, he returned to Laotaimen and found a business card that had been burned by fire in the cracks of the stairs, with a vague letter - D on it. It has nothing to do with the case. He pocketed it. First piece. Shaoxing is just the beginning. He doesn't understand yet. But he set off.