The list of past mystery book challenges was long enough to need splitting into two threads. Books with titles starting with A - L are here:
http://www.eaforums.com/showthread.php?threadid=2456
Here are the titles that start with M - Z:
Magician's Nephew, The (by C.S. Lewis) picked by quasar, #86
Mandy (by Julie Andrews Edwards) picked by Dani257, #47
Mischief (by Chris Wilson) picked by phoenixx, #54
Miss Manners on Weddings by Judith Martin (picked by theeye, #28)
Murder on a Girl's Night Out (by Ann George) picked by hypotenuse, #44
My Family and Other Animals by Gerald Durrell (picked by hadassahchana, #95)
Mysterious by Fabio (picked by jankp, #21)
Nine Nations of North America, The (by Joel Garreau) picked by CurtisEdmonds, #83
1984 by George Orwell (picked by theeye, #65)
O, Jerusalem by Laurie King (picked by dani257, #14)
One Fish Two Fish, Red Fish Blue Fish (by Dr. Seuss) picked by theeye, #40
One Hundred Years of Solitude by Gabriel Marcia Marquez (picked by AuntieEmma, #66)
Oxford English Dictionary (picked by hadassahchana, #41)
Passage to India, A (by E. M. Forster) picked by hadassahchana, #17
Peter Pan (by J.M. Barrie) picked by eplovejoy, #51
Postmodern Pooh (by Frederick Crews) picked by AuntieEmma, #73
Presumed Innocent by Scott Turow (picked by CurtisEdmonds, #94)
Princess Bride, The (by William Goldman) picked by crankybeer, #33
Prophet, The (by Kahlil Gibran) picked by jankp, #3
Psst: It's Me . . . the Bogeyman by Barbara Park (picked by jankp, #25)
Ramona Quimby, Age 8 (by Beverly Cleary) picked by jenninca, #46
Rituals of Dinner, The: The Origins, Evolution, Eccentricities, and Meaning of Table Manners by Margaret Visser (picked by theeye, #32)
Roman Blood by Steven Saylor (picked by Redlass, #48)
Salaryman's Wife by Sujata Massey (picked by murasaki, #20)
Screwtape Letters, The (by C. S. Lewis) picked by Redlass, #15
Second Sex, The (by Simone de Beauvoir) picked by murasaki, #77
Shards of Honor (by Lois McMaster Bujold) picked by quasa, #71
Spin Cycle: Inside the Clinton Propaganda Machine by Howard Kurtz (picked by eplovejoy, #64)
Swampwalker's Journal, The (by David M. Carroll) picked by hadassahchana, #89
Swiftly Tilting Planet, A (by Madeline L'Engle) picked by quasar, #80
Thank You for Smoking (by Christopher Buckley) picked by AuntieEmma, #97
That's Mr. Faggot to You: Further Details from my Queer Life by Michael Thomas Ford (picked by hadassahchana, #29)
Time and Again (by Jack Finney) picked by theeye, #70
To Sir, With Love by Edward Ricardo Braithwaite (picked by quasar, #31)
Tragedy of Pudd'nhead Wilson, The (aka Pudd'nhead Wilson and Those Extraordinary Twins) by Mark Twain (picked by murasaki, #53)
Tree Grows in Brooklyn, A (by Betty Smith) picked by amykhar, #23
Washington Goes to War (by David Brinkley) picked by CurtisEdmonds, #98
Where the Red Fern Grows (by Wilson Rawls) picked by ms_n, #45
Winnie the Pooh by A. A. Milne (picked by hadassahchana, #10 and again for #99)
Witness for the Prosecution by Agatha Christie (picked by Redlass, #1)
Your Money or Your Life: Transforming Your Relationship with Money and Achieving Financial Independence by Joe Dominguez and Vicki Robin (picked by mjfrombuffalo, #78)