Plucky Englishwoman Joan Webster travels to the remote islands of the Scottish Hebrides in order to marry a wealthy industrialist. Trapped by inclement weather on the Isle of Mull and unable to continue to her destination, Joan finds herself charmed by the straightforward, no-nonsense islanders around her, and becomes increasingly attracted to naval officer Torquil MacNeil, who holds a secret that may change her life forever.

Quatermass is the director of an important scientific base, where he builds nuclear rockets for the colonization of the Moon. A strange fall of meteorites in a nearby village leads to the discovery of a huge base under a strict military control, officially a factory of artificial food. Quatermass reveals that the factory is actually breeding alien creatures.