"The Great War is over and jobs are scarce. Tommy Beresford and Prudence "Tuppence" Cowley, who were friends before the war, run into each other in London and discover they are both equally short of money and opportunities. On a whim, they decide to start a business, advertising themselves as "The Young Adventurers." Their first job leads them into a series of increasingly dangerous situations involving international spies, a society beauty, a Russian...

"Tommy and Tuppence Beresford have just become the proud owners of an old house in an English village. Along with the property, they have inherited some worthless bric-a-brac, including a collection of antique books. While rustling through a copy of The Black Arrow, Tuppence comes upon a series of apparently random underlinings. However, when she writes down the letters, they spell out a very disturbing message: "Mary Jordan did not die naturally."...

"Six years have passed since the Beresfords first began their sleuthing partnership and marriage in 'The Secret Adversary'. Tommy now has a desk job with the British Secret Service, and Tuppence is at home. But when the chief of British Intelligence calls upon them to take over the International Detective Agency, which has been a tool of the Bolsheviks involved in spying activities, both are ready for a new adventure. Tommy poses as Mr. Blunt, the...