[Spoilers]. In Vernor Vinge (1999), A Deepness in the Sky (New York: Tor: 0812536355). On pp. 699-700, a brief paragraph completely reverses your understanding of the progress of the book's main plot:
Sherkaner Underhill didn't seem to notice. He moved his head back and forth under the [game] helmet's light show. 'There has to be reconnect. There has to be.' His hands twitched at the game controls. Seconds passed. 'It's all messed up now,' he sobbed."
When you finish that paragraph, your picture of what is going on in the story is turned upside down.