Stephen Murray is a national of a foreign government who has been in Britain for decades, becoming a respected nuclear physicist. One day he's found in the hands of that foreign government, being transported back against his wishes. He asks for asylum and it's granted. He is sent to a research facility, where he continues his work for peaceful exploitation of science with the aid of brilliant assistant June Thornburn. He keeps busy; besides his research, he's stealing scientific work for his government.
It's a dull little spy drama, going through all the less dramatic ways in which espionage is carried out; technically interesting, but the occasionally blaring score by Ken Thorne lets you know that something VERY DRAMATIC has just occurred. Still, it's an interesting role for Murray, his last on the big screen, as it is for Miss Thornburn. She might have made more movies, but she died in a plane crash in 1967.