Far beneath the blue Caribbean sea lies Deepcore, the world's most advanced high-technology drilling station. When a mysterious force sends the submarine USS Montana spinning out of control, Deepcore is commandeered as the base for a naval rescue operation. Lindsay Brigman, designer of Deepcore, insists on joining the team. When the operation gets underway, she witnesses something astonishing, activity she can only define as non-terrestrial intelligence. Nobody takes her seriously - there are far more pressing concerns. For up above, the world is spinning towards nuclear war...