What horror novel do you find the most terrifyingly realistic? I.E. the scariest thing is that this could actually happen.
Well, in order to fit the criteria of an event that could actually happen you would be very limited in your number of choices. It would have to be some nuclear war or environmental collapse scenario, I imagine, so perhaps a novel like Cormac McCarthy’s The Road, or a television production like the English film Threads, which I can best describe as The Day After for grownups.