Watch out, Hollywood. If you think the box-office slump is bad now, just wait until next week, when people will be reading instead of going to theaters. Scholastic is distributing 10.8 million copies of Harry Potter and the Half-Blood Prince on its July 16 debut, setting up the series' sixth installment to have the biggest book-sales day in history, USA Today reports. Advance sales of J.K. Rowling's little novel have already reached 771,000 on Amazon, and the online book retailer recently declared the author their No. 1 best-seller. Rounding out the list are Who Moved My Cheese? scribe Spencer Johnson, romance writer Nora Roberts and The Da Vinci Code's Dan Brown.