The Secret Adversary

Published in 1922, The Secret Adversary is a detective fiction novel by Agatha Christie that introduces the spirited duo of Tommy Beresford and Prudence Tuppence Cowley. As they form The Young Adventurers, Ltd, they become embroiled in a mysterious case involving the disappearance of a young woman with diplomatic secrets, set against the backdrop of post-war London. The story is known for maintaining its suspense and engaging narrative throughout.