Based on sales for the week ending January 20, 2013

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

17. Believing the Lie
Elizabeth George, NAL, $16, 9780451237699

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

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

20. The Age of Miracles
Karen Thompson Walker, Random House, $15, 9780812982947

21. The Hobbit
J.R.R. Tolkien, Mariner, $13.95, 9780547928227

22. The Lifeboat
Charlotte Rogan, Reagan Arthur, $14.99, 9780316185912

23. The Uninvited Guests
Sadie Jones, Harper Perennial, $14.99, 9780062116512

24. The Dressmaker
Kate Alcott, Anchor, $15, 9780307948199

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

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

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

28. The Tiger's Wife
Téa Obreht, Random House, $15, 9780385343848

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

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

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

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

33. The Brief Wondrous Life of Oscar Wao
Junot Diaz, Riverhead, $16, 9781594483295

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

35. Cutting for Stone
Abraham Verghese, Vintage, $15.95, 9780375714368

36. Dark Places
Gillian Flynn, Three Rivers, $14, 9780307341570

37. Waiting for Sunrise
William Boyd, Harper Perennial, $15.99, 9780061876776

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

39. The Keeper of Lost Causes
Jussi Adler-Olsen, Plume, $16, 9780452297906

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

41. The Best American Short Stories 2012
Tom Perrotta, Heidi Pitlor (Eds.), Mariner, $14.95, 9780547242101

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

43. The Cat's Table
Michael Ondaatje, Vintage, $15, 9780307744418

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

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

46. Caleb's Crossing
Geraldine Brooks, Penguin, $16, 9780143121077

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

48. 11/22/63
Stephen King, Gallery, $19.99, 9781451627299

49. City of Dark Magic
Magnus Flyte, Penguin, $16, 9780143122685

50. The Shoemaker's Wife
Adriana Trigiani, Harper, $15.99, 9780061257100