The Great War is over, and jobs are scarce. Tommy Beresford and Prudence "Tuppence" Cowley meet and agree to start their own business as The Young Adventurers. They are hired for a job that leads them both to many dangerous situations, meeting allies as well, including an American millionaire in search of his cousin. Reviews were generally positive on this adventure, which manages to keep the identity of the arch-criminal secret to the very end.