The Secret Adversary

In 1919 London, demobilised soldier Tommy Beresford reunites with his childhood friend and war volunteer Prudence "Tuppence" Cowley. Out of work and money, they form "The Young Adventurers, Ltd". Their first client, a Mr Whittington, makes Tuppence a suspiciously generous offer. Remembering a seemingly unrelated anecdote of Tommy’s, when Whittington asks Tuppence her name, she gives him the alias "Jane Finn." A shocked Whittington offers her £50 hush money and disappears. Carter, an old friend of Tommy's from British intelligence, tells them that Jane Finn was a British agent who disappeared while attempting to deliver a secret treaty to the American embassy in London. Tommy and Tuppence agree to find her, but Carter warns them about an enemy agent known only as "Mr Brown." Also searching for Jane Finn is her cousin Julius Hersheimmer, an American multimillionaire. =