Three displaced children hitchhike to Buenos Aires, where they get involved in street-crime and heavier stuff. Positive-role-model adults offer a balance to those negative influences.
Grace Peterson works in department stores "Tutto per Tutti", along with many other young people. His employment contract entitling them to live in a boarding house built specifically for them by the company but on the other hand, forbid them not fall in love or marry under threat of dismissal.
Hoppy and Lucky have been called in to investigate a series of stage holdups. The robbers are taking gold from Colby's mine and Hoppy suspects it may be ex-outlaw Colby himself.
The coming of the pioneer settlers in 1840, the making of their first homes in the wilderness, the gold rushes, the Maori wars, the stage coaches, and the frontier towns.