Forensic insect scholar Shen Yuan visited his girlfriend and learned that she had been killed on Bird Island. Although his girlfriend's parents identified her on the spot and DNA evidence confirmed that her girlfriend was murdered, insects removed from the body were tested to infer that his girlfriend shouldn't have been killed at the time of the murder. In order to uncover the truth of the matter, Criminal Police Ding Wei launched an investigation --This is the first domestic and foreign comprehensive novel using insect breaking technology. Insects live over four seasons of spring, summer, autumn and winter, involving dozens of species of flies.