Based on sales for the week ending September 15, 2013

16. NW
Zadie Smith, Penguin, $16, 9780143123934

17. Sweet Tooth
Ian McEwan, Anchor, $15.95, 9780345803450

18. The Language of Flowers
Vanessa Diffenbaugh, Ballantine, $15, 9780345525550

19. A Hologram for the King
Dave Eggers, Vintage, $15.95, 9780307947512

20. Winter of the World
Ken Follett, NAL, $25, 9780451419248

21. Joyland
Stephen King, Hard Case Crime, $12.95, 9781781162644

22. The Unlikely Pilgrimage of Harold Fry
Rachel Joyce, Random House, $15, 9780812983456

23. The Paris Wife
Paula McLain, Ballantine, $15, 9780345521316

24. The Secret Keeper
Kate Morton, Washington Square Press, $16, 9781439152812

25. Fifty Shades of Grey
E.L. James, Vintage, $15.95, 9780345803481

26. Orphan Train
Christina Baker Kline, Morrow, $14.99, 9780061950728

27. Insane City
Dave Barry, Berkley, $16, 9780425264720

28. The Bartender's Tale
Ivan Doig, Riverhead, $16, 9781594631481

29. Fahrenheit 451
Ray Bradbury, S&S, $13.99, 9781451673319

30. Tell the Wolves I'm Home
Carol Rifka Brunt, Dial, $15, 9780812982855

31. The Alchemist
Paulo Coelho, HarperOne, $14.99, 9780061122415

32. The Racketeer
John Grisham, Bantam, $16, 9780345545336

33. Bring Up the Bodies
Hilary Mantel, Picador, $16, 9781250024176

34. The O. Henry Prize Stories 2013
Laura Furman (Ed.), Anchor, $15.95, 9780345803252

35. Ender's Game
Orson Scott Card, Tor, $9.99, 9780765337542

36. The Art of Hearing Heartbeats
Jan-Philipp Sendker, Other Press, $14.95, 9781590514634

37. Wolf Hall
Hilary Mantel, Picador, $16, 9780312429980

38. The Beautiful Mystery
Louise Penny, Minotaur, $15.99, 9781250031129

39. The Night Circus
Erin Morgenstern, Anchor, $15, 9780307744432

40. Defending Jacob
William Landay, Bantam, $15, 9780345533661

41. The Chaperone
Laura Moriarty, Riverhead, $16, 9781594631436

42. Fifty Shades Darker
E.L. James, Vintage, $15.95, 9780345803498

43. Fifty Shades Freed
E.L. James, Vintage, $15.95, 9780345803504

44. The 100-Year-Old Man Who Climbed Out the Window and Disappeared
Jonas Jonasson, Hyperion, $15.99, 9781401324643

45. The Yellow Birds
Kevin Powers, Back Bay, $14.99, 9780316219341

46. The Catcher in the Rye
J.D. Salinger, Back Bay, $13.99, 9780316769174

47. The Perks of Being a Wallflower
Stephen Chbosky, MTV Books, $14, 9781451696196

48. State of Wonder
Ann Patchett, Harper Perennial, $15.99, 9780062049810

49. World War Z
Max Brooks, Broadway, $14.95, 9780770437411

50. A Hundred Flowers
Gail Tsukiyama, St. Martin's Griffin, $15.99, 9781250022547