Hennie Scott

In the future New York City, the Deputy Commissioner of Police is assisted by a robot detective in solving the murder of a scientist.

Sheffield, England: someone in the steelworks is selling details of a new alloy to a foreign agent. The children lead to his capture with the help of a prize pigeon.

Supported avidly by his mother and more reluctantly at first by his father, a working-class Austrian boy joins the Vienna Choirboys, where he proves to be unusually talented.

Three children track their lost piano with one note missing through London.

An incompetent boarding school headmaster, Professor Jim Edwards, devises a bizarre plot to raise the profile of his boarding school, and thus save his job, by passing off his bookie's son as a Middle Eastern prince. The headmaster's madcap scheme is further complicated when an official from the Foreign Office arrives and announces that a real prince is to be placed under Edwards supervision, not due to the schools lofty reputation, but that a gang of kidnappers are unlikely to look for the regal child there.