This is a series of stories with a bizarre premise I don't think i have seen in any other work in the covert intelligence agency internals genre. The greatest threats to humanity have the ability to disguise themselves by tampering with minds so they are either not perceived at all, or given no attention by the conscious mind, or removed from memory entirely afterwards. This allows them to do anything our kind world otherwise oppose and makes it nearly impossible to mount a defense without some powerful technology. There are a couple major characters working at the agency of the title whom we follow as they discover, over and over - they are the only ones who can counter a species-ending threat from some other universe. The mature of the mimetic threat causes even written documents to decay, so there are garblings and elisions when things get bad. At the climax of the book an unwilling bystander outside of the foundation is drawn in to set into motion a plan to defeat the cosmic horror. I don't know how this kind of story could be told in any other medium and still be satisfying. The reader is the only one in the end to know what a sacrifice had been made by people utterly forgotten by the reconstructed world. Quite a storytelling feat.