I enjoyed "The Grin of the Dark" very much. It seems Campbell has developed new levels of subtlety with this novel. I liked the fact that the precise nature of the menace is never clearly defined throughout. There is a lurking threat that never quite crystallises to something tangible that the reader can grasp hold of. And at the end it I was left wondering whether the protagonist has himself truly grasped it or merely become its victim, another agent it is using to further its aims.
Campbell has not shied away from modern themes, exploring the way people interact with strangers on the internet, the way that the internet is becoming the way we define truth even though on-line information is constantly changing and is being changed. By subverting information on the internet one can subvert our notions of truth, society and even others sense of who they are. The boundary between on-line and physical reality is breaking down. Does this make the internet the ultimate tool for a malevolent agency to pursue its nefarious aims?