Little Dorrit is a novel by Charles Dickens, originally serialized from 1855 to 1857. The title character, Amy Dorrit, begins the novel in Marshalsea Prison where her father is held as a debtor, as Dickens' own father had been in the 1820s.
Free online texts
Gutenberg: Little Dorrit. EPUB, HTML, MOBI and TXT formats.
Internet Archive: Little Dorrit. EPUB, MOBI, PDF and TXT formats.
University of Adelaide (Internet Archive): Little Dorrit. EPUB, HTML and MOBI formats.
Wikisource: Little Dorrit. HTML and other formats.
Further reading at Tom's Learning Notes
Bloom's Western Canon: Little Dorrit is included.