Based on sales for the week ending May 5, 2013

16. A Lady Cyclist's Guide to Kashgar
Suzanne Joinson, Bloomsbury, $16, 9781608198337

17. The Sandcastle Girls
Chris Bohjalian, Vintage, $15.95, 9780307743916

18. The Sense of an Ending
Julian Barnes, Vintage, $14.95, 9780307947727

19. Life of Pi
Yann Martel, Mariner, $15.95, 9780547848419

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

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

22. Beastly Things
Donna Leon, Penguin, $15, 9780143123248

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

24. The Yard
Alex Grecian, Berkley, $16, 9780425261279

25. The Prisoner of Heaven
Carlos Ruiz Zafón, Harper Perennial, $14.99, 9780062206299

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

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

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

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

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

31. Death Comes to Pemberley
P.D. James, Vintage, $15, 9780307950659

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

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

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

35. Stag's Leap
Sharon Olds, Knopf, $16.95, 9780375712258

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

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

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

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

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

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

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

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

44. The Silver Linings Playbook
Matthew Quick, Sarah Crichton Books, $15, 9780374533571

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

46. Ready Player One
Ernest Cline, Broadway, $14, 9780307887443

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

48. The Next Best Thing
Jennifer Weiner, Washington Square Press, $16, 9781451617764

49. The Art of Racing in the Rain
Garth Stein, Harper, $14.99, 9780061537967

50. A Land More Kind Than Home
Wiley Cash, Morrow, $14.99, 9780062088239