I recommend several textbooks for studying true crime's investigation and analysis: criminal (or criminal) investigation, criminal technology, crime scene investigation and forensic medicine. If you want to extend it a little further, look: criminal psychology, investigation.
These books should be the most relevant and valuable professional books for our criminal investigation enthusiasts, which is very helpful to exercise reasoning ability, analyze real cases and enrich relevant knowledge.
Other books related to popular science and solving crimes can also be read and played.
Final recommendation: The Manual of Crime Scene Investigation by Dr. Li Changyu represents the latest technology and research results of international crime investigation, which is very valuable. At present, 4,000 copies are issued in China, which is relatively expensive (only Xinhua Bookstore has the right to sell, and there are not many online bookstores in 280 yuan. A book about 150 yuan, which has applied for many copyrights, and has no electronic version).