Ibrin has the correct answer, but misspoke: the "Index" in question was the detailed Index/dictionary which Tolkien prepared in 1966 for the 2nd Edition of the Lord of the Rings (not the Sil) but never finished. Hammond and Scull quote from it extensively in their Companion and Guide.
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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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