'The Secret Adversary' by Agatha Christie - the renowned Queen of Crime - introduces two of Christie's most beloved characters: Tommy Beresford and Tuppence Cowley, who form a business offering their services for hire after World War I. This is Book #1 of the five book 'Tommy and Tuppence' mystery series.

Their first case begins when they search for a missing woman named Jane Finn, who vanished while carrying a secret treaty that could endanger Britain. As they delve deeper, they uncover a web of espionage, political intrigue, and deception led by a mysterious figure known only as 'Mr. Brown.' Through clever deduction, courage, and teamwork, Tommy and Tuppence navigate danger, betrayal, and hidden identities to expose the elusive adversary.

'The Secret Adversary' is presented here in its original and unabridged format.