I wouldn't necessarily jump on the Watchers 'inhabited by some evil spiirit' as necessarily entrapping unhoused fear. Adfter all, like any good classically-educated Englishman Tolkien was familiar with the Platonic tripartite soul, and the Watchers for all we can tell were possessed merely of the sensual, not the nutritive or rational.
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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