Greyhound

Greyhound is a real-life private detective. Different from the detectives in film and television works who punish evil and promote good, Greyhounds in the real world are a group of illegal criminals who illegally obtain other people's privacy and profit by means of tracking, secret photography, monitoring, positioning, and deception. You may have never come into contact with a greyhound, but greyhounds really exist around you and me. I would like to use this book to warn the world that the sky net is vast and sparse, and it is important not to go astray, and always pay attention to privacy.