A story in which first one letter and then another start to go missing from words. The reader thinks it a string of typos until she groks that it is central to the narrative -- the abolition of c r. We start to see that an alien intelligence is waging war not against our infrastructure but our language.
A story in the form of a series of scientific papers, each with multiple authors, detailing a dangerous experiment. Each new paper, adding more detail and narrating advances in the experiment, has one fewer authors than the previous one. It dawns on the reader that the experiment is killing the scientists off, one at a time.
A whodunnit with a twist: our very concept of 'who' -- human identity and personality -- is the criminal.