HER BACK PAGES: You can tell a lot about a book from its index. Consider Elizabeth Warren’s “This Fight Is Our Fight,” reviewed by Paul Krugman and new to the hardcover nonfiction list at No. 1. On its face, the book — subtitled “The Battle to Save America’s Middle Class” — is all about economic issues, and the index is correspondingly flecked with terms like “layoffs” (one citation), “manufacturing decline” (one citation) and “rent assistance” (two citations). But really these are just the parsley on the meatloaf. Flip through the back pages and it’s clear that Warren, the hard-punching Massachusetts senator, has a more personal fight in mind: The index listing for “Trump, Donald” is divided into dozens of subcategories beginning with “bait-and-switch and” (two citations), then moving on to “bigotry and” (four citations), “corporate influences on” (five citations) and “trickle-down and” (seven citations). There are also listings for “tax returns and,” “‘nasty woman’ comment of” and — my favorite — “tweetstorms vs.,” which directs readers to a four-page recap of Warren’s social media battle with Trump during the presidential race. “I tweeted about how he cheated hardworking people who had built his hotels and golf courses,” she recalls. “I mentioned his bullying, his attacks on women, his racism, his obvious narcissism. And in that first tweetstorm, I did my best to sound the alarm: This guy is dangerous, and he could end up as president of the United States.”

THE O’REILLY FACTOR: In the cultural economy, the best-seller list is a lagging indicator. Even “instant” books need time to be pitched, approved, written and printed, so it can take months for the list to catch up with the zeitgeist. That’s why it’s too soon to say how Bill O’Reilly’s recent ouster from Fox News over multiple sexual harassment claims might affect the fortunes of Bill O’Reilly, author. For now, though, there are still a couple of O’Reilly titles on the hardcover nonfiction list: “Killing the Rising Sun,” about the end of World War II, is No. 13, and “Old School,” about the importance of traditional values, is No. 4.

AYUH: Anita Shreve’s new novel, “The Stars Are Fire,” about a series of wildfires in 1940s Maine, hits the hardcover fiction list at No. 11. “I seem to be particularly drawn to Maine,” Shreve told WBUR Radio in Boston recently. “There’s a kind of flintiness of character that echoes the jagged rocks and the view of the sea.”