Peter Cushing stars as a man who works in a research institute that makes cures from plagues. Everyone there soon finds that their work is put on what is called the "Official Secrets" page within the government.
This makes everyone a bit angry and one of the workers attempts what may be called treason by trying to get some of the cures to other countries.
It is very interesting to see Cushing is a very different role as a quiet professor who runs the establishment. The supporting cast includes Ian Bannen, Virginia Maskell, Thorley Walters, Donald Pleasense and Spike Milligan.