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A new hobby experimenting with crystal radio sets leads Tom Pauling and his friends into a world of danger and espionage. First of the Radio Detectives series. This exciting mystery was originally published in 1922.

The radio detectives centers on youthful ambition, technological curiosity, and the tension between discovery and danger. A young boy with a passion for building a crystal radio set finds encouragement in his home environment, where his interest in emerging technologies is seen...