Counter-spies race to stop the sale of an American atomic scientist and his secrets in Switzerland.

This Counterspy broadcast aired on October 20, 1949. It is listed as episode 406 in the archive. ABC Radio Network carried the broadcast. The cast includes Don MacLaughlin and Mandel Kramer. Other credited names include Marx B. Loeb as director, Phillips H. Lord as producer, Palmer Thompson as writer, and Bob Shepherd as announcer.

The surviving recording runs about 31 minutes. The broadcast is also associated with Pepsi Cola (camera premium).

An espionage and counterintelligence series centered on agent David Harding and his fight against enemy spies, saboteurs, and organized threats to the United States.

Listeners can expect thriller, adventure, and crime, episodic drama in format, and suspenseful, serious, and tense in tone.