This was the first in a series of spy dramas inspired by Phillips H. Lord's then popular radio series. While the title character played by St. John does appear, the majority of the action belongs to naval officer Parker who is assigned to investigate the murder of the head of a torpedo
plant. Parker suspects the dead man's wife, Long, to be involved with spies and so he romances her to get some clues. Unfortunately, he falls in love with her and begins to doubt her complicity in the espionage. The rest of the ring is caught eventually, but not before they (the spies) kill Long
because of her love for Parker. A fast-paced programmer.