"Take another look at this Detective Handbook. See if there's anything hidden in it!"
Someone spoke in a low voice.
Very soon, everyone repeatedly checked through the contents of the Detective Handbook.
It only recorded the things the other man had gone to inspect, and the routes he had taken.
However, the man had been very smart. He had not written down the killer's name, probably because he had been worried someone else would discover this secret too.
He had wanted to sweep up all the benefits for himself.
"That guy was seriously too selfish!" someone couldn't help saying.
"Exactly. If he'd been a little more selfless, we wouldn't be in this much trouble."
"Then again, if he'd been a little more selfless, the killer would have been caught long ago."
"Forget it, forget it. Classic movie plot. One person knows the killer's secret but doesn't tell everyone. Usually, people like that end up dead."
"Yeah, he really was an idiot."
"Couldn't agree more. This guy was way too stupid. If he'd been even a little smarter, he wouldn't have died."
Everyone sighed with deep regret.
They had been on the verge of solving the case, only to get stuck.
Before long, the Old Woman Detective suddenly pointed at a page in the handbook and said, "Look here. There's a riddle."
"I don't think this riddle was written randomly. He deliberately set it up as a safeguard against being killed."
Everyone immediately looked over, and saw a poem written there in striking lines:
"Where twin peaks stand face to face, their shadows fall into the heart of the river."
"A returning boat comes late from a thousand miles away, one oar piercing through the clouds."
"As long as we decipher this poem, I believe the killer's identity should come to