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.
Ferdie
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.
