Sandra Brown's Friction debuted at #2 on Apple’s iBooks bestseller list for the week ended August 24. The novel, which went on sale August 18, landed one spot behind The Girl on the Train by Paula Hawkins, which held onto its lead from the previous week.

With back to school approaching, of the top 20 paid books on the list, four were textbooks. Biology came in at #5; World History at #11, The Americans at #18, and Chemistry at #20.

iBooks US Bestseller List - Paid Books

1. The Girl on the Train by Paula Hawkins - 9780698185395 - (Penguin Publishing Group)
2. Friction by Sandra Brown - 9781455581177 - (Grand Central Publishing)
3. Small Wars: A Jack Reacher Story by Lee Child - 9780804178846 - (Random House Publishing Group)
4. Grey by E L James - 9781101946350 - (Knopf Doubleday Publishing Group)
5. Biology by Ph.D., Ph.D., Joseph S. Levine & Kenneth R. Miller - 9780133226713 - (Pearson Education, Inc.)
6. The Murderer's Daughter by Jonathan Kellerman - 9780804177498 - (Random House Publishing Group)
7. The Martian by Andy Weir - 9780804139038 - (Crown/Archetype)
8. Who Do You Love by Jennifer Weiner - 9781451617832 - (Atria Books)
9. Alert by James Patterson & Michael Ledwidge - 9780316407182 - (Little, Brown and Company)
10. Luckiest Girl Alive by Jessica Knoll - 9781476789651 - (Simon & Schuster)
11. World History by Dahia Ibo Shabaka, Larry S. Kreiger, Linda Black, Phillip C. Naylor & Roger B. Beck - 9780544025387 - (Houghton Mifflin Harcourt)
12. Paper Towns by John Green - 9781101010938 - (Penguin Young Readers Group)
13. Four Week Fiance by Helen Cooper & J. S. Cooper - 9781940218403 - (J. S. Cooper)
14. The Nightingale by Kristin Hannah - 9781466850606 - (St. Martin's Press)
15. All the Light We Cannot See by Anthony Doerr - 9781476746609 - (Scribner)
16. Go Set a Watchman by Harper Lee - 9780062409874 - (Harper)
17. Dark Places by Gillian Flynn - 9780307459923 - (Crown/Archetype)
18. The Americans by Gerald A. Danzer, J. Jorge Klor De Alva, Larry S. Krieger, Louis E. Wilson & Nancy Woloch - 9780544025486 - (Houghton Mifflin Harcourt)
19. Code of Conduct by Brad Thor - 9781476717173 - (Atria/Emily Bestler Books)
20. Chemistry by Antony Wilbraham, Dennis Staley, Edward Waterman & Michael Matta - 9780133226621 - (Pearson Education, Inc.)