The Secret Adversary

Set in 1919, young couple Tommy Beresford and Tuppence Cowley form a partnership, hiring themselves out as ''young adventurers''. Their first case, however, is more of an adventure than they expect - working to find documents that, if they were known to the general public, would fuel a communist revolution in Britain.

Agatha Christie is the world's best-known mystery writer. Her books have sold over a billion copies in the English language, and another billion in 44 foreign languages. She is the most widely published author of all time in any language,…