Question: When did the spouse of Catherine Dickens write his last book?

full_context: Document 1: Charles Dickens: The Posthumous Papers of the Pickwick Club (Known as ``The Pickwick Papers '') (Monthly serial, April 1836 to November 1837)
Document 2: Dora Annie Dickens: Dora Annie Dickens (16 August 1850 – 14 April 1851) was the infant daughter of English novelist Charles Dickens and his wife Catherine. She was the ninth of their ten children, and the youngest of their three daughters.
Document 3: Sydney Smith Haldimand Dickens: Sydney Smith Haldimand Dickens (18 April 1847 – 2 May 1872) was a Royal Navy officer; the fifth son and seventh child of English novelist Charles Dickens and his wife Catherine.
Document 4: A Tale of Two Cities: A Tale of Two Cities Cover of serial Vol. V, 1859 Author Charles Dickens Illustrator Hablot Knight Browne (Phiz) Cover artist Hablot Knight Browne (Phiz) Country United Kingdom Language English Genre Historical novel Published 1859 Publisher London: Chapman & Hall Pages 341 pages (Paperback) Preceded by Little Dorrit (1855 -- 1857) Followed by Great Expectations (1860 -- 1861)
Document 5: Charles Dickens: The Posthumous Papers of the Pickwick Club (Known as ``The Pickwick Papers '') (Monthly serial, April 1836 to November 1837) The Adventures of Oliver Twist (Monthly serial in Bentley's Miscellany, February 1837 to April 1839) The Life and Adventures of Nicholas Nickleby (Monthly serial, April 1838 to October 1839) The Old Curiosity Shop (Weekly serial in Master Humphrey's Clock, April 1840 to November 1841) Barnaby Rudge: A Tale of the Riots of Eighty (Weekly serial in Master Humphrey's Clock, February to November 1841) A Christmas Carol (1843) The Life and Adventures of Martin Chuzzlewit (Monthly serial, January 1843 to July 1844) Dombey and Son (Monthly serial, October 1846 to April 1848) David Copperfield (Monthly serial, May 1849 to November 1850) Bleak House (Monthly serial, March 1852 to September 1853) Hard Times: For These Times (Weekly serial in Household Words, 1 April 1854, to 12 August 1854) Little Dorrit (Monthly serial, December 1855 to June 1857) A Tale of Two Cities (Weekly serial in All the Year Round, 30 April 1859, to 26 November 1859) Great Expectations (Weekly serial in All the Year Round, 1 December 1860 to 3 August 1861) Our Mutual Friend (Monthly serial, May 1864 to November 1865) The Mystery of Edwin Drood left unfinished due to Dickens's death (Monthly serial, April 1870 to September 1870)
Document 6: Charles Dickens: Dickens's literary success began with the 1836 serial publication of The Pickwick Papers. Within a few years he had become an international literary celebrity, famous for his humour, satire, and keen observation of character and society. His novels, most published in monthly or weekly instalments, pioneered the serial publication of narrative fiction, which became the dominant Victorian mode for novel publication. Cliffhanger endings in his serial publications kept readers in suspense. The instalment format allowed Dickens to evaluate his audience's reaction, and he often modified his plot and character development based on such feedback. For example, when his wife's chiropodist expressed distress at the way Miss Mowcher in David Copperfield seemed to reflect her disabilities, Dickens improved the character with positive features. His plots were carefully constructed, and he often wove elements from topical events into his narratives. Masses of the illiterate poor chipped in ha'pennies to have each new monthly episode read to them, opening up and inspiring a new class of readers.
Document 7: Barnaby Rudge: "Barnaby Rudge" was the fifth of Dickens' novels to be published. It had initially been planned to appear as his first, but changes of publisher led to many delays, and it first appeared in serial form in the "Clock" from February to November 1841.
Document 8: Alfred D'Orsay Tennyson Dickens: Alfred D'Orsay Tennyson Dickens (28 October 1845 – 2 January 1912) was the sixth child and fourth son of English novelist Charles Dickens and his wife Catherine. He made lecture tours in Australia, Europe and the United States on his father's life and work.
Document 9: John Dickens: Described by his son Charles as "a jovial opportunist with no money sense", unable to satisfy his creditors, on 20 February 1824 John Dickens was imprisoned in the Marshalsea Debtors' Prison under the Insolvent Debtors Act of 1813, because he owed a baker, James Kerr, £40 and 10 shillings. In April 1824 his wife, Elizabeth, joined her husband in the Marshalsea with their four youngest children. John Dickens was released after three months, on 28 May 1824, as a result of the death of his mother, Elizabeth Dickens, of the parish of St George, Hanover Square, who had left him the sum of £450 in her will. On the expectation of this legacy, Dickens petitioned for, and was granted, release from prison. Under the Insolvent Debtors Act, Dickens arranged for payment of his creditors, and he and his family left Marshalsea for the home of Mrs. Roylance, with whom his 12-year-old son Charles was lodging.
Document 10: Francis Dickens: Francis Jeffrey Dickens (15 January 1844 – 11 June 1886) was the third son and fifth child of Victorian English novelist Charles Dickens and his wife Catherine Dickens née Hogarth.
Document 11: Francis Austen: Born the son of the Reverend George Austen and Cassandra Austen (the daughter of the Reverend Thomas Leigh), and the brother of the novelist Jane Austen, Francis Austen joined the Royal Navy in April 1786. After graduating at the Royal Naval Academy at Portsmouth, he was appointed to the fifth-rate HMS "Perseverance" on the East Indies Station. Promoted to midshipman in December 1789, he joined the third-rate HMS "Crown" and then transferred to the fifth-rate HMS "Minerva" in November 1791. In HMS "Minerva" he took part in a blockade of the coast of Mysore.
Document 12: Augustus Dickens: Augustus Dickens was the son of Elizabeth ("née" Barrow) and John Dickens, a clerk in the Navy Pay Office at Portsmouth. Charles Dickens's pen name, 'Boz', was actually taken from his youngest brother's family nickname 'Moses', given to him in honour of one of the brothers in "The Vicar of Wakefield" (one of the most widely read novels in the early 19th century), which when playfully pronounced through the nose became corrupted as 'Boses', and later shortened to 'Boz' – pronounced with a long vowel 'o' through the nose.
Document 13: Oliver Twist: The novel was originally published in monthly instalments in the magazine Bentley's Miscellany, from February 1837 to April 1839. It was originally intended to form part of Dickens's serial, The Mudfog Papers. George Cruikshank provided one steel etching per month to illustrate each instalment. The novel first appeared in book form six months before the initial serialisation was completed, in three volumes published by Richard Bentley, the owner of Bentley's Miscellany, under the author's pseudonym, "Boz". It included 24 steel-engraved plates by Cruikshank.
Document 14: Henry Fielding Dickens: Sir Henry Fielding Dickens, KC (16 January 1849 – 21 December 1933) was the eighth of ten children born to English author Charles Dickens and his wife Catherine. The most successful of all of Dickens's children, he was a barrister, a KC and Common Serjeant of London, a senior legal office which he held for over 15 years. He was also the last surviving child of Dickens.
Document 15: Great Expectations: Great Expectations is the thirteenth novel by Charles Dickens and his penultimate completed novel: a bildungsroman that depicts the personal growth and personal development of an orphan nicknamed Pip. It is Dickens's second novel, after David Copperfield, to be fully narrated in the first person. The novel was first published as a serial in Dickens's weekly periodical All the Year Round, from 1 December 1860 to August 1861. In October 1861, Chapman and Hall published the novel in three volumes.
ground_truth: April 1870 to September 1870
sub_queries: Catherine Dickens >> spouse Answer: Charles Dickens
when did Charles Dickens write his last book Answer: April 1870 to September 1870