| title | creator | language | description | tableOfContents | contributor | subject | created |
| The Mysterious Wanderer, Vol. I | Reeve, Sophia | en | | | | | 2010-09-24 |
| The Mysterious Shin Shira | Farrow, G. E. (George Edward), 1866?-1920? | en | | | Easton, W.G. [Illustrator] | | 2006-02-24 |
| The Mysterious Murder of Pearl Bryan
or: the Headless Horror. | Unknown | en | | | | Bryan, Pearl, d. 1896; Jackson, Scott, d. 1897 -- Trials, litigation, etc.; Walling, Alonzo, d. 1897 -- Trials, litigation, etc.; Murder -- Kentucky -- Fort Thomas; Trials (Murder) -- Kentucky -- Campbell County | 2009-08-02 |
| The Mysterious Affair at Styles | Christie, Agatha, 1890-1976 | en | | | | Detective and mystery stories; Private investigators -- England -- Fiction; Belgians -- England -- Fiction; Poirot, Hercule (Fictitious character) -- Fiction | 1997-03-01 |
| Boy Scouts Mysterious Signal
or Perils of the Black Bear Patrol | Ralphson, G. Harvey (George Harvey), 1879-1940 | en | | | | World War, 1914-1918 -- Juvenile fiction; Boy Scouts of America -- Juvenile fiction | 2007-10-12 |
| The Mysterious Stranger | Twain, Mark, 1835-1910 | en | | The Mysterious Stranger -- A Fable -- Hunting the Deceitful Turkey -- The McWilliamses and the Burglar Alarm. | | Short stories; Humorous stories, American; United States -- Social life and customs -- 19th century -- Fiction | 2008-06-09 |
| The Mysterious Rider | Grey, Zane, 1872-1939 | en | | | | | 2004-11-03 |
| The Rover Boys on a Hunt
or The Mysterious House in the Woods | Stratemeyer, Edward, 1862-1930 | en | | | | Hunting stories; World War, 1914-1918 -- Fiction | 2007-07-07 |
| Fantazius Mallare
A Mysterious Oath | Hecht, Ben, 1894-1964 | en | | | Smith, Wallace, 1888-1937 [Illustrator] | | 2008-11-14 |