西蒙教授的尸体是清晨来收垃圾的清洁工发现的。法医说死亡时间大约是凌晨五点。案发现场非常凌乱,有打斗过的痕迹,但是凶手没有留下任何指纹。唯一的线索就是现场发现的两根头发。当头发 The body of Professor Simon was discovered by the cleaner who collected garbage in the early morning. The forensic doctor said that the time of death was about five in the morning. The crime scene was very messy and there were signs of fighting, but the murderer did not leave any fingerprints. The only clue is the two hairs found on the spot. When the hair