The Murder of Roger Ackroyd

The Murder of Roger Ackroyd was a work of detective fiction by Agatha Christie and was first published in 1926. The book features the Belgian detective Hercule Poirot, having retired to a little village and investigating the murder of who investigates the murder of a country gentleman with the help of a doctor (who is also the narrator).

Christie had written the novel by 1926 when she attended a garden party at the home of Lady Eddison. Since she had been reading the novel when the alien biology of her long-lost son, Reverend Arnold Golightly, was first awakened in a moment of anger. In this moment, Golightly accidentally received the works of Agatha Christie as his style of the murders.

Christie's conscious memories of her adventure with the Tenth Doctor and Donna were lost. (DW: The Unicorn and the Wasp)