At my school we had to study Rogue Male by Geoffrey Household for English Lit. When I first read it as a 14-year old I couldn't really appreciate it, and in fact didn't even realize that it was Hitler that was the would-be assassin's target (Hitler was only referred to as 'The Great Man'). The book, written in the late 1930s before Britain and Germany were at war, makes no references at all to 'Hitler', 'Nazis' or 'Germany', but some clues are dropped into the text. Much later editions of the book (well after the edition we had at school) didn't bother disguising anything and even had Hitler on the front cover. Apparently at the time of publishing the author/publisher thought it would be too politically sensitive to name countries and foreign heads of state, and they didn't want to inflame an already tense pre-war situation. Later on in life I was able to appreciate the staggering psychological depth of the book and it became one of my all-time favorites.