The Short-Wave Mystery (en Inglés) - Franklin W. Dixon

Frank and Joe Hardy stumble upon a strange radio call for help that leads them into a tangled web of industrial espionage and theft. When a local company is targeted by criminals stealing valuable electronic components, the brother detectives suspect a connection to the odd broadcasts they have intercepted on their short-wave set.

The mystery deepens when a friend becomes involved with a suspicious taxidermy auction, where stuffed animals appear to be more than mere trophies.

As the teen sleuths investigate, they uncover a plot involving secret transmitters hidden inside taxidermy specimens and a ruthless gang operating across the Canadian border. From high-speed boat chases to a perilous flight into the frozen wilderness of Hudson Bay, the boys must use their wits and technical skills to track down the gang!