The Murder of Roger Ackroyd
From Tardis Wiki, the free Doctor Who reference
The Murder of Roger Ackroyd was a work of detective fiction by Agatha Christie.
Christie had written the novel by 1926 when she attended a garden party at the home of Lady Eddison. Since Lady Eddison 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. (TV: The Unicorn and the Wasp)
