Based on sales for the week ending April 24, 2011

16. Ape House
Sara Gruen, Spiegel & Grau, $15, 9780385523226

17. My Name Is Mary Sutter
Robin Oliveira, Penguin, $15, 9780143119135

18. Half Broke Horses
Jeannette Walls, Scribner, $15, 9781416586296

19. Every Last One
Anna Quindlen, Random House, $15, 9780812976885

20. Tinkers
Paul Harding, Bellevue Literary Press, $14.95, 9781934137123

21. The Solitude of Prime Numbers
Paolo Giordano, Penguin, $15, 9780143118596

22. A Question of Belief
Donna Leon, Penguin, $15, 9780143118954

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

24. The Double Comfort Safari Club
Alexander McCall Smith, Anchor, $14, 9780307277480

25. The Three Weissmanns of Westport
Cathleen Schine, Picador, $14, 9780312680527

26. The Sweetness at the Bottom of the Pie
Alan Bradley, Bantam, $15, 9780385343497

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

28. Solar
Ian McEwan, Anchor, $15, 9780307739537

29. The Girl With the Dragon Tattoo
Stieg Larsson, Vintage, $14.95, 9780307454546

30. The Best of It
Kay Ryan, Grove, $14.95, 9780802145215

31. The Lacuna
Barbara Kingsolver, Harper Perennial, $16.99, 9780060852580

32. The Forgotten Garden
Kate Morton, Washington Square Press, $15, 9781416550556

33. Sarah's Key
Tatiana De Rosnay, St. Martin's, $13.95, 9780312370848

34. The Invisible Bridge
Julie Orringer, Vintage, $15.95, 9781400034376

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

36. True Grit
Charles Portis, Overlook, $14.95, 9781590204597

37. The Elegance of the Hedgehog
Muriel Barbery, Europa Editions, $15, 9781933372600

38. Anthill
Edward Osborne Wilson, Norton, $14.95, 9780393339703

39. Lord of Misrule
Jaimy Gordon, Vintage, $15, 9780307946737

40. The Windup Girl
Paolo Bacigalupi, Night Shade, $14.95, 9781597801584

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

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

43. The Ice Princess
Camilla Lackberg, Free Press, $15, 9781451621747

44. Heart of the Matter
Emily Giffin, St. Martin's, $14.99, 9780312554170

45. The Finkler Question
Howard Jacobson, Bloomsbury, $15, 9781608196111

46. Remarkable Creatures
Tracy Chevalier, Plume, $15, 9780452296725

47. The Godfather of Kathmandu
John Burdett, Vintage, $14.95, 9781400097074

48. Infinite Jest
David Foster Wallace, Back Bay, $17.99, 9780316066525

49. The Mapping of Love and Death
Jacqueline Winspear, Harper Perennial, $14.99, 9780061727689

50. Pearl of China
Anchee Min, Bloomsbury, $15, 9781608193127