I read Inverted World on the Kindle. It always annoys me that you’re put at the start of the text on opening. I like to go back to the cover and work forward. Sometimes I use the contents links for that, and I think I might have done so here, skipping the introduction, because they nearly always contain spoilers.
So I started with the famous opening sentence I wrote about. But because I linked to the book’s Wikipedia page, I skimmed the article. Which mentioned a prologue, that I had somehow missed.
As it happens, missing the prologue didn’t really matter, didn’t affect my enjoyment of the book. But first, I don’t know how people can refer to the first sentence of Chapter 1 as the opening sentence, when there’s a prologue full of sentences before it.
And second, be careful how you read your ebooks. You might miss something.