The Mystery of Edwin Drood is the last novel by Charles Dickens, left unfinished at his death in 1870, after six of a planned twelve parts had been published in serialization.
The story is set in Cloisterham, a thinly-veiled version of the Kent cathedral town of Rochester, the setting for a murder to which the title refers. A number of adaptations have attempted to provide a resolution to the story.
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Free online texts
Gutenberg: The Mystery of Edwin Drood. EPUB, HTML, MOBI and TXT formats.
Internet Archive: The Mystery of Edwin Drood, with an introduction by Cecil Day-Lewis and an essay by Edmund Wilson. EPUB, MOBI, PDF and TXT formatsd.
University of Adelaide (Internet Archive): The Mystery of Edwin Drood. EPUB, HTML and MOBI formats.
Wikisource: The Mystery of Edwin Drood. HTML and other formats.
Librivox: The Mystery of Edwin Drood - Public domain audiobook.
Orwell Foundation: Charles Dickens, by George Orwell. A valuable critical essay.
Wikipedia: Charles Dickens - The Mystery of Edwin Drood
Further reading at Tom's Learning Notes
Bloom's Western Canon: The Mystery of Edwin Drood is included.