This book is science fiction. It is about “ Cluster of World”, a comprehensive VR platform. Users can upload their consciousness to the server of the “Cluster” and immerse themselves in various virtual worlds. It includes every service you can imagine, basically the infrastructure of the society. Meanwhile, serial killing cases, whose victims are the users, frighten the whole society. Victims are found dead, without any wounds, in the user terminals. A policewoman and an engineer start to investigate the case. Digging into this mystery, the two of them aren’t aware that the evil claw is getting closer and closer...