Aunt Zhao sent me outside. When she first came to the door, she suddenly opened her mouth and seemed to have something to say. After I saw she was going to speak, I immediately stopped and asked, "Auntie, is there something on your mind?" She raised her hands and rubbed her temples. She said with a very serious look, "I went to the balcony that night to get some things. I inadvertently saw the lights next door were off. But I didn't care at that time. I suddenly thought of it now, and I don't know if it will help you." The lights were off? Listening to her words, I suddenly became excited and asked, "So, can you remember what time it was that night?" Aunt Zhao looked down and thought for a moment before she looked at me again. "It should have been after seven o'clock," she said. "My husband and I had just had dinner." The forensic doctor discovered that Qiu Nan was killed around eight p.m., which meant that she had not had an accident at that time, but the lights in the house were turned off. "How about the electricity circuits in this community? Do sudden power outages usually happen?" I asked. Aunt Zhao slowly nodded and said, "This community was built decades ago, and the circuitry is aging. In the rainy seasons and the windy seasons, there will be occasional power outages, but they happen in the whole building or several buildings, not just in a single one." I nodded and said a few words to Aunt Zhao and left my mobile number with her, so if she thought of something else, she could call me. I walked downstairs to meet with Xiao Teng, and I thought about the clues provided by Aunt Zhao on the way. If the lights were turned off at seven, did it mean that the murderer was in the house at that time? But why did the murderer turn off the lights? Could the murderer see clearly in the dark? Nevertheless, Aunt Zhao did not know whether the light was turned on later because she and her husband had watched TV and chatted before they went to sleep. It could be a.s.sumed that during the time they watched TV and chatted, Qiu Nan, who was next door, was cruelly killed. I still thought that there was a problem with the lights being turned off. Thinking of this, I suddenly changed my mind. Qiu Nan could have been in the house as usual, and the lights were all suddenly turned off. "Zhuxuan, any clues?" It was Xiao Teng! My thoughts quickly returned to reality. "There are clues, but I am still guessing. What about you?" Xiao Teng was somewhat disappointed. "There are only two security guards in this community. They are in the guardroom. They didn't know what had happened the night Qiu Nan was killed. He said that everything was about the same as usual." We came to the rest chair in the community, and then I told him the clues provided by Aunt Zhao, which were the courier and the lights that were turned off. "It should be easy. As long as I check Qiu Nan's online shopping records, I can find the courier. As for the light being off thing, I will check the electricity information. But what can this information prove?" Obviously, Xiao Teng did not understand what I meant. I talked to him briefly on the way back to the police station. Speaking of the extinguished lights, Qiu Nan had not been killed yet at seven o'clock. But she wouldn't turn off the lights at home when she was alone. There was also no reason for the murderer to turn off the light in the house. After all, it was an unfamiliar place and it was at night, and no one could see the unfamiliar environment without the lights turned on Xiao Teng nodded and said, "Is it because Qiu Nan had turned off the lights? She realized that something was wrong, so she turned off the lights, and pretended that no one was at home?" "We haven't checked Qiu Nan's weblog yet. After going back, you check and see if there are any new discoveries on her weblog. Many girls like to post small things on their weblog, such as a small accident or a power outage." Nonetheless, Xiao Teng frowned and said, "It wouldn't be a power outage unless she owed on the electricity bill. Otherwise, there was no power outage in the whole building. How could it be only in her home?" What he said made sense. I could only record the thoughts first on my notebook. I would rethink them after I went back and calmed down. "Well, I think it is necessary to look at the distribution box in Qiu Nan's home." I also recorded this in my notebook and I planned to let my colleagues check it out. Xiao Teng investigated Qiu Nan's online shopping record and her activities. I leaned on the chair and looked at my notebook, which was all about the information of the case. I circled in the suspicious points and found clues. After calming down, I thought about the night when Qiu Nan was killed. The suspect Su Dahai and his wife both had proof of not being present. The murderer would have been another person. Things in the house were not stolen, which showed that the murderer did not kill for money. Qiu Nan did not have s.e.x before her death, which showed that the murderer did not kill her out of the s.e.xual desire. She had no friends and enemies in this city and her interpersonal relations.h.i.+p was extremely simple. I really couldn't find any other suspects at this time. The relations.h.i.+p between her and Su Dahai was very stable. Su Dahai liked her because she was young and energetic. Also, her figure was good and she was beautiful. Qiu Nan was with him for the money and comfortable living environment. They took what they needed and they didn't affect each other's lives. Su Dahai's wife only knew that there was such a person, but she did not care about her. It seemed that Su Dahai and his wife had no motive for the killing. Even if they paid for the murder, they would definitely not leave the body in the house, and neither would they carve up the body with a knife. "Zhuxuan, come over and see this!" Xiao Teng shouted. He was pointing at the computer screen, and said, "This is the shopping record for Qiu Nan. She had bought quite a lot of things. The strange thing was that it was always the same courier that delivered things: Jiang Xiaoqiang." "I am familiar with this name." I picked up the files on the table and began to look up as I spoke. I saw these three words in a short time. He was the last person that Qiu Nan had contacted. The contact time was around seven that night. After the inquiry, Jiang Xiaoqiang said that Qiu Nan only asked him if there were her courier packages. "Remove the call records of Qiu Nan and Jiang Xiaoqiang and check the specific call time. I think this courier has concealed something," I said. Xiao Teng asked, "Do you think it is abnormal that there is only one courier with so many shopping records?" I nodded, but I had other thoughts. For example, the courier usually informed the customer that the packages had arrived, unless it was beyond the delivery deadline or it was in a rush delivery. But I just took a look at Qiu Nan's shopping record and I discovered nothing had been delivered that day. Therefore, Jiang Xiaoqiang had to be lying. "Got it. The call started at 6:50 that night, and ended at 7:06. Sure enough, it is impossible for them just to talk about the package for sixteen minutes," Xiao Teng muttered as his eyes lit up.