Agatha Christie, The Secret Adversary by Agatha Christie (Agatha Christie Mysteries)

The Secret Adversary is a work of detective fiction by Agatha Christie. The book introduces the characters of Tommy and Tuppence who feature in three other Christie books and one collection of short stories written throughout her writing career.

Agatha Christie
(15 September 1890 – 12 January 1976) was a British crime writer of novels, short stories, and plays. According to the Guinness Book of World Records, Christie is the best-selling novelist of all time. She is best remembered for her 66 detective novels and more than 15 short story collections (especially those featuring Hercule Poirot or Miss Jane Marple), and her successful West End plays.
-Wikipedia.com