Barry Jones plays the idealist scientist and Andre Morell plays a Scotland Yard superintendent leading the manhunt to find him. While the almost impossible search takes place the government begins the enormous task of evacuating one of the largest cities in the world. This goes pretty well though all considering, though we're only a few years after WW2 so the Army and authorities had plenty of practice in mass personnel deployment!
A tense and well structured suspense movie. The characters are well drawn, the scientist for example is misguided rather than evil. Supporting characters add a bit of lightness where needed.
