Based on sales for the week ending April 15, 2012

16. Doc
Mary Doria Russell, Ballantine, $15, 9780812980004

17. A Visit From the Goon Squad
Jennifer Egan, Anchor, $14.95, 9780307477477

18. The Saturday Big Tent Wedding Party
Alexander McCall Smith, Anchor, $14.95, 9780307472984

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

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

21. The Girl Who Played With Fire
Stieg Larsson, Vintage, $15.95, 9780307454553

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

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

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

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

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

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

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

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

30. The Lady of the Rivers
Philippa Gregory, Touchstone, $16, 9781416563716

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

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

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

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

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

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

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

38. To Kill a Mockingbird
Harper Lee, Perennial, $13.99, 9780060935467

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

40. Mr. Churchill's Secretary
Susan Elia MacNeal, Bantam, $15, 9780553593617

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

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

43. The Pale King
David Foster Wallace, Back Bay , $16.99, 9780316074223

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

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

46. Now You See Her
James Patterson, Michael Ledwidge, Grand Central, $14.99, 9780446574709

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

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

49. City of Thieves
David Benioff, Plume, $15, 9780452295292

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