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At 10 a. M. On August 14, 2024, Detective Li Qiang sat in his office with a cup of coffee and a pile of documents in front of him. His assistant Xiao Wang came in with a letter in his hand. "Li Qiang, this is your letter." Xiao Wang said and handed the letter to Li Qiang. Li Qiang opened the letter and saw that it read: "Dear Mr. Detective, I am an anonymous person. I know you are a very good detective, so I want to ask you to do me a favor. I heard that there was a bizarre disappearance case recently. A man named Zhang Hua disappeared mysteriously in his home. I think there must be some secret hidden behind this case, so I want to ask you to help investigate. If you can find the truth, I will give you a generous reward." After Li Qiang read the letter, he felt excited. He has always been eager to take on a really big case, and this time he finally got the chance. He immediately stood up and said to Xiao Wang: "Xiao Wang, get ready, we will set off immediately." Xiao Wang nodded and began to prepare the tools and equipment needed for the investigation. After a while, Li Qiang and Xiao Wang came to Zhang Hua's home. They carefully checked every corner of the room, trying to find some clues. They found that the things in the room were arranged very neatly, without any signs of fighting or struggle. However, they found an unsent email on Zhang Hua's computer. The content of the email was: "Dear, I know you have been looking for me. But, you will never find me. Because, I am dead." After Li Qiang and Xiao Wang read the email,