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.