Follows ten year-old Johnny who stands out in different aspects way beyond his age. Things change when his new teacher sees his potential, believes in him and wants to open a new world to him.
Childhood friends Tommy and Tuppence meet in London after having served in World War I. Recently "demobed", short of money, and with no job prospects, they decide to become adventurers for hire. Soon, they are employed by the British Government to locate a secret treaty signed before the war.