You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when was and then there were none published?" whose answer is 6 November 1939.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when was and then there were none published
Useful Output:

Doc 1: Published by William Morrow and Harper Collins, 1939, 256 pages. “Ten little soldiers went out to dine; / One choked his little self and
Doc 2: Set on a fictional island on the coast of Devon, England, “And Then There Were None” takes place in the 1930s. It radiates that old-time feel
Doc 3:  Then There Were None. Christie's 1939 novel is her biggest-selling title, with sales of more than 100m. It opens with 10 people arriving on
Doc 4: Agatha Christie's And Then There Were None is the highest-selling crime novel of all time, with over 100 million copies sold since it was published in 1939.
Doc 5: Background and context​​ And Then There Were None was first published in 1939, in a period marked by global tensions leading up to World War II.