This film was planned as a documentary, and its style is definitely documentary all the way, sticking carefully to actual details, everything being filmed on location in Ottawa and Montreal, so there is little space left for acting and cinematography, although Harry Townes portrays Gouzenko very well and makes him perfectly convincing, something between Henry Fonda and Mel Ferrer; and the documentary strictness makes the film notable for meticulous and impeccable realism. This is a sequel to the vitally important "The Iron Curtain" seven years earlier with Dana Andrews and Gene Tierney, which carefully told the whole story of the drama of the defection, so this is valuable as a compliment to that film carefully exposing the consequences of the drama and why Gouzenko practically for the rest of his life had to continue appearing masked whenever he had to make a public performance or put himself visibly at risk.