When Mount Crona (think about it) erupts, there are four people stuck on the hillside, just dying to be rescued. Fortunately you happen to have a helicopter handy for that purpose.
The idea is to pick up each of the men in turn, before the lava flows reach him, and take him to the safety of your (apparently fireproof) helicopter base on the other side of the mountain. This would be easy were it not for a few difficulties that nature and Acornsoft put in your way.
Firstly the men can only hang on to the helicopter for a short time. You have to return to base as quickly as possible. This isn't easy as there are boulders exploding out of the volcano. These are not conducive to good flying. It is just as well that your helicopter is equipped with a boulder-blasting gun. More tricky are the ghosts. If one of the four men to be rescued dies (from falling or lava) then he turns into an indestructible, and understandably annoyed, ghost.
Volcano is a very catchy game. The graphics are as quick and smooth as we've come to expect from Acornsoft. Not a blockbuster, but it should run.