Based on a true story, this documentary-style caper film follows a federal agent on a dangerous assignment -- he must go underground to flush out a nefarious spy ring. Leonard Maltin praises this suspenseful political tales as "low key, and effective." Starring Frank Lovejoy ("Home of the Brave," "House of Wax"), favorite '50s quiz show guest Dorothy Hart and Philip Carey ("Calamity Jane," "Dead Ringer").