Firefighter Yu Tong accidentally reunites with his long-lost friend, Detective Lin Yao, because of a spontaneous combustion case in a lake. The two go to various fire sites to investigate the case and find the culprit.They are not afraid of dangers and use efficient and reliable investigation methods, advanced technical means, and flexible inspection methods to detect complex fire cases. While exploring the truth of the accident, they also summarize effective methods to prevent and control fire risks..In the process, Yu Tong gradually uncovered the truth about the fire that happened in his factory, found the real culprit behind the accident, and cleared his father's name.