Colleen Hoover’s IT STARTS WITH US sold over 800,000 units in the US on its publication day, Tuesday, October 18, publisher Atria reported. That includes considerable pre-orders, along with sales across all major formats (print, ebooks, and digital audiobooks). Atria printed 2.5 million copies, across four printings, and said the book “was the most pre-ordered novel in Simon & Schuster history.” Update: NPD Bookscan subsequently recorded opening week sales of 809,000 hardcovers alone through the outlets that they track.