Little Dorrit
by Charles Dickens
;Poverty
The novel begins in Marseilles "thirty years ago" (c. 1826), with the notorious murderer Rigaud telling his cellmate John Baptist Cavalletto how he killed his wife. Arthur Clennam is detained with other travellers in quarantine in Marseilles and becomes friends with some, including Mr Meagles, his wife, daughter, and her maid (Tattycoram), as well as Miss Wade. He is returning to London to see his mother after 20 years in China with his father, handling that part of the family business. His father died there. On his deathbed, his father had given him a mysterious message, murmuring "Your mother," which message and a watch Arthur mails to Mrs Clennam.
thumb|Mr Flintwinch has a mild attack of irritability
Inside the watch casing is an old silk paper with the initials DNF (do not forget) worked in beads. It is a message, but the implacable Mrs Clennam, who now uses a wheelchair, refuses to tell him what it means. The two become estranged.
In London, William Dorrit, imprisoned as a debtor, has been a resident of Marshalsea debtors' prison for over twenty years. He has three children: Edward, Fanny and Amy. The youngest daughter, Amy, was born in the prison and is affectionately known as Little Dorrit. Their mother died when Amy was eight years old. Fanny lives outside the prison with William's older brother, Frederick. The adult children are free to pass in and out of the prison as they please. Little Dorrit, devoted to her father, supports them both through her sewing. To the honour of her father, who is embarrassed to acknowledge his financial position, Little Dorrit avoids mentioning her work outside the prison or his inability to leave. Mr Dorrit assumes the role of Father of the Marshalsea, and is held in great respect by its inhabitants, as if he had chosen to live there.
After Arthur tells his mother that he will not continue in the family business, Mrs Clennam chooses her clerk Jeremiah Flintwinch as her partner. When Arthur learns that Mrs Clennam employs Little Dorrit as a seamstress, showing unusual kindness, he wonders whether the young girl might be connected with the mystery of the watch. Arthur follows the girl to the Marshalsea. He tries in vain to enquire about William Dorrit's debt in the Circumlocution Office, assuming the role of benefactor towards Little Dorrit, her father, and her brother. While at the Circumlocution Office he meets the successful inventor Daniel Doyce. Doyce wants a partner and man of business at his factory and Clennam agrees to fill that role. Little Dorrit falls in love with Arthur, but Arthur fails to recognise Little Dorrit's feelings.
Arthur is reacquainted with his former fiancée Flora Finching, the reason he was sent away to China, who is now an unattractive widow, and accompanied by the aunt of her late husband. Her father Mr Casby owns many rental properties, and his rent collector is Mr Pancks. The indefatigable Pancks discovers that William Dorrit is the lost heir to a large fortune, enabling him to pay his way out of prison, altering the status of the entire family.
;Riches
The now wealthy Dorrits decide that they should tour Europe as a newly respectable rich family. They travel over the Alps and take up residence for a time in Venice, and finally in Rome, displaying pride over their new-found wealth and position, unwilling to tell their past to new friends. Little Dorrit finds it difficult to adjust to their wealth and new social position, and slowly comes to appreciate the new places and new sights. Fanny adjusts rapidly to the ways of society, and is sought by the same young man, Edmund Sparkler, who pursued her in her poverty in London, but with a new start that is acceptable to his mother. In Rome, at a party, Mr Dorrit falls ill, and dies at their lodgings. His distraught brother Frederick dies that same night. Little Dorrit, left alone, returns to London to stay with newly married Fanny and her husband, the dim-witted Edmund Sparkler.
thumb|left|Engraving of "Little Dorrit", 1856
The financial house of Merdle, Edmund Sparkler's stepfather, ends with Merdle's suicide; the collapse of his bank and investment businesses takes with it the savings of the Dorrits, the firm of Doyce and Clennam, Arthur Clennam, and Pancks. Clennam is now imprisoned in the Marshalsea, where he becomes ill. When Little Dorrit arrives in London, she slowly nurses him back to health.
Cavalletto finds the villain Rigaud hiding in London as Blandois, and brings him to Arthur Clennam. Held in the prison, he sends this undesirable man to his mother, who has advertised to find him. As Blandois he tries to blackmail Mrs Clennam with his full knowledge of her past. Mrs Clennam had insisted on bringing up little Arthur and denying his biological mother the right to see him. Mrs Clennam feels this is her right to punish others, because they hurt her. Arthur's biological mother died about the same time as Arthur went off to China, but lived out of England with Flintwinch's twin brother. Mr Clennam's wealthy uncle, stung by remorse, had left a bequest to Arthur's biological mother and to the youngest daughter of her patron, or if no daughter, the youngest child of his brother. The patron was Frederick Dorrit, the kind musician who had taught and befriended Arthur's biological mother, and the beneficiary is his niece, Amy Dorrit. Blandois left a copy of the papers he obtained from Jeremiah's brother at the Marshalsea for Little Dorrit.
Mrs Clennam knows of this inheritance and fails to tell Little Dorrit, or to tell Arthur about his biological mother. Unwilling to yield to blackmail and with some remorse, the rigid woman rises from her chair and totters out of her house to reveal the secret to Little Dorrit at the Marshalsea. Mrs Clennam begs her forgiveness, which the kind-hearted girl freely grants. Returning to home, Mrs Clennam falls in the street, never to recover the use of her speech or limbs, as the house of Clennam literally collapses before her eyes, killing Rigaud. Affery was outdoors seeking her mistress, and Jeremiah had escaped London before the collapse with as much money as he could find. Rather than hurt him, Little Dorrit chooses not to reveal any of this to Arthur; when he is well, she asks him to burn the papers.
Mr Meagles seeks the original papers, stopping to ask Miss Wade. She has them but denies it; Tattycoram slips back to London with the papers and presents them to Mr Meagles, who gives them to Little Dorrit. Mr Meagles then seeks out Arthur's business partner Daniel Doyce from abroad. He returns a wealthy and successful man, who arranges to clear all debts for Arthur's release. Arthur is released from the prison with his fortunes revived, his position secure with Doyce, and his health restored. Arthur and Little Dorrit marry.