Christie novel is a term used to refer to the works of Agatha Christie, a prolific English writer of mystery novels, short stories, and plays. The most famous Christie novel is 'The ABC Murders', which was first published in 1936. It follows the story of Hercule Poirot, a Belgian detective, as he attempts to solve a series of murders that are connected by the letters of the alphabet. Another popular Christie novel is 'The Murder of Roger Ackroyd', which was first published in 1926. It follows the investigation of a murder in a small village, and features the character of Dr. James Sheppard. Finally, 'And Then There Were None' is another classic Christie novel, first published in 1939. It follows the story of ten strangers who are invited to an island, only to find themselves being murdered one by one.