U-31(Henry Phyfe)must get some microfilm from a Japanese connection at the same time he must throw a birthday party for Judy's mother Florence
Henry must get a list of names of agents from an enemy agent who knew U-31 sometime back.
A man has stolen government documents and threatens to expose the entire security operation.He will only deal with U-31, and Henry Phyfe is pressed into action to pay money for the documents
Phyfe must get information from a hostile source about where a scientist is being held hostage.