Agatha Christie stated in her autobiography that Crooked House was one of her favourite pieces of work, and in the forward to the novel Christie commented on how much she enjoyed writing it. It is also said that the publisher did not approve of the identity of the murderer in this story and asked Christie to change it, but she resisted this request and kept the original ending. The revelation of the truth at the end of Crooked House still has the capacity to shock readers today.
The title of the story is a reference to the nursery rhyme “There was a crooked man”, which ends with the phrase “and all lived together in a crooked house”. The "crooked man" here is Aristide Leonides, a Greek immigrant who is …
Lee, Amy. "Crooked House". The Literary Encyclopedia. First published 08 October 2003
[http://www.litencyc.com/php/sworks.php?rec=true&UID=5804, accessed 18 January 2017.]