Based on sales for the week ending April 14, 2013

16. Rules of Civility
Amor Towles, Penguin, $16, 9780143121169

17. World War Z
Max Brooks, Three Rivers, $14.95, 9780307346612

18. Wool
Hugh Howey, S&S, $15, 9781476733951

19. The Snow Child
Eowyn Ivey, Reagan Arthur/Back Bay Books, $14.99, 9780316175661

20. Last Friends
Jane Gardam, Europa Editions, $16, 9781609450939

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

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

23. Canada
Richard Ford, Ecco Press, $15.99, 9780061692031

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

25. The Limpopo Academy of Private Detection
Alexander McCall Smith, Anchor, $14.95, 9780307472991

26. Things Fall Apart
Chinua Achebe, Anchor, $11.95, 9780385474542

27. The Forgotten
David Baldacci, Grand Central , $14.99, 9781455523153

28. Sharp Objects
Gillian Flynn, Three Rivers, $14, 9780307341556

29. The Expats
Chris Pavone, Broadway, $15, 9780770435721

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

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

32. 1Q84
Haruki Murakami, Vintage, $16.95, 9780307476463

33. The Kingmaker's Daughter
Philippa Gregory, Touchstone , $16, 9781451626087

34. Calico Joe
John Grisham, Bantam, $14, 9780345536648

35. In One Person
John Irving, S&S, $15.99, 9781451664133

36. The Buddha in the Attic
Julie Otsuka, Anchor, $13.95, 9780307744425

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

38. Cloud Atlas
David Mitchell, Random House, $15, 9780812984415

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

40. What We Talk About When We Talk About Anne Frank
Nathan Englander, Vintage, $15, 9780307949608

41. The Kitchen House
Kathleen Grissom, Touchstone, $16, 9781439153666

42. Alif the Unseen
G.Willow Wilson, Grove Press, $16, 9780802121226

43. Fahrenheit 451
Ray Bradbury, S&S, $11.99, 9781451673319

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

45. City of Thieves
David Benioff, Plume, $16, 9780452295292

46. The Art of Fielding
Chad Harbach, Back Bay, $14.99, 9780316126670

47. Billy Lynn's Long Halftime Walk
Ben Fountain, Ecco, $14.99, 9780060885618

48. Swamplandia!
Karen Russell, Vintage, $14.95, 9780307276681

49. The Marriage Plot
Jeffrey Eugenides, Picador, $16, 9781250014764

50. How It All Began
Penelope Lively, Penguin, $16, 9780143122647