Rachel and Sam are at home alone with their dog Choky when the biggest volcano on New Zealand's Volcanic Plateau erupts without warning.
With the roads destroyed by the earthquakes that follow, and the lake deadly, there is no way to escape. Their chances of surviving are not looking good. Then another vicious eruption lands Guld, a strange little man made of volcanic rock, right on their doorstep. In order to save themselves and the country, Guld explains, they will need to adventure to the very heart of the problem - to the volcano itself. But are they brave enough? And will they have the time and quick-thinking needed to conquer Nature's deadliest forces? For now, only one things is for sure: if they are to live, they will have to try.