Based on sales for the week ending April 1, 2012

16. The Girl With the Dragon Tattoo
Stieg Larsson, Vintage, $15.95, 9780307949493

17. Extremely Loud and Incredibly Close
Jonathan Safran Foer, Mariner, $14.95, 9780547735023

18. Clara and Mr. Tiffany
Susan Vreeland, Random House, $15, 9780812980189

19. A Discovery of Witches
Deborah Harkness, Penguin, $16, 9780143119685

20. A Lesson in Secrets
Jacqueline Winspear, Harper Perennial, $14.99, 9780061727719

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

22. The American Heiress
Daisy Goodwin, St. Martin's, $14.99, 9780312658663

23. Sarah's Key
Tatiana De Rosnay, St. Martin's, $13.99, 9781250004345

24. The Great Gatsby
F.Scott Fitzgerald, Scribner, $15, 9780743273565

25. Room
Emma Donoghue, Back Bay, $14.99, 9780316098328

26. Dreams of Joy
Lisa See, Random House, $15, 9780812980547

27. Major Pettigrew's Last Stand
Helen Simonson, Random House, $15, 9780812981223

28. Before I Go to Sleep
S.J. Watson, Harper, $14.99, 9780062060563

29. The Patrick Melrose Novels
Edward St Aubyn, Picador, $20, 9780312429966

30. When the Killing's Done
T.C. Boyle, Penguin, $16, 9780143120391

31. The Story of Beautiful Girl
Rachel Simon, Grand Central, $12, 9780446574457

32. Elizabeth I
Margaret George, Penguin, $17, 9780143120445

33. Tinker Tailor Soldier Spy
John le Carré, Penguin, $16, 9780143120933

34. A Game of Thrones
George R.R. Martin, Bantam, $17, 9780553386790

35. Little Bee
Chris Cleave, S&S, $15, 9781416589648

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

37. Hotel on the Corner of Bitter and Sweet
Jamie Ford, Ballantine, $15, 9780345505347

38. The Wise Man's Fear
Patrick Rothfuss, DAW, $19, 9780756407124

39. The Forgotten Waltz
Anne Enright, Norton, $15.95, 9780393342581

40. The Dovekeepers
Alice Hoffman, Scribner, $16, 9781451617481

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

42. Freedom
Jonathan Franzen, Picador, $16, 9780312576462

43. The Lucky One
Nicholas Sparks, Grand Central, $14.99, 9781455508969

44. Horoscopes for the Dead
Billy Collins, Random House, $15, 9780812975628

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

46. Abraham Lincoln: Vampire Hunter
Seth Grahame-Smith, Grand Central, $13.99, 9780446563079

47. Let the Great World Spin
Colum McCann, Random House, $15, 9780812973990

48. Fifty Shades of Grey
E.L. James, Writer's Coffee Shop, $29.99, 9781612130286

49. Emily, Alone
Stewart O'Nan, Penguin, $15, 9780143120490

50. The Submission
Amy Waldman, Picador, $15, 9781250007575