U.S. security agent John Ireland suspects that someone is smuggling atomic devices into America. When he makes his report, Ireland is assured by his superiors that nothing untoward is going on. In fact, the higher-ups have had the wool pulled over their eyes by a clever Communist saboteur, who is assembling a super-bomb, with plans to detonate the doomsday weapon somewhere in the States. If we had to have cold-war thrillers, replete with Commie bad guys wearing baggy suits and calling everyone "Comrade", it's too bad that all of these films weren't as entertaining as Columbia's The 49th Man. The original story was written by Ivan Tors, later the producer of such classic TV series as Science Fiction Theater and Sea Hunt.
~ Hal Erickson, All Movie Guide