6-12-50 to 10-26-50 NBC, various 30 minute timeslots. STAR: Ilona Massey as a Mata Hari-style operative in World War II.  ORCHESTRAL: Roy Shield. WRITER-DIRECTOR: Harry W. Junkin. Top secret was highly effective, said Radio Life: the role played by the Hungarian actress was âtailor-made for her sultry voice and heavy accentâ