Here are the bestsellers for the week that ended Saturday, Jan. 6, compiled from data from independent and chain bookstores, book wholesalers and independent distributors nationwide, powered by Circana BookScan © 2024 Circana. (Reprinted from Publishers Weekly, published by PWxyz LLC. © 2024, PWxyz LLC.) HARDCOVER FICTION 1. “Iron Flame” by Rebecca Yarros (Red Tower) Last week: 1 2. “Fourth Wing” by Rebecca Yarros (Red Tower) Last week: 2 3. “The Heaven & Earth Grocery Store: A Novel” by James McBride (Riverhead) Last week: 3 4. “Upside Down: A Novel” by Danielle Steel (Delacorte) Last week: —…