Savant

Both the plot and the problem are puzzles for the reader to solve

Synopsis: On a future Earth which is continually hidden from malign alien forces in the galaxy by a surrounding shield of invisibility sustained by psychics, some kind of data infection begins to slowly destroy the ability of the shield-generators, and the system monitors must figure out what's wrong, and fix it, before the Earth becomes the target of those aliens.

What I thought: This is another SF story which opens in media res, leaving a lot unexplained, and the reader has to figure out the background from the book jacket synopsis (information which, strangely, does not really appear anywhere in the book) and the clues given as events progress. It's interesting, and I quite enjoyed it, though I am not sure that the experimental structure of the narrative works as well as it could.