A U.S. Naval aircraft on a routine weather patrol in the Caribbean encounters 'Mabel', a ferocious hurricane that should, nevertheless, pass harmlessly among the islands. But David Wyatt, civilian weather expert, has developed a sixth sense about hurricanes and is convinced that Mabel will change course and strike the island of San Fernandez and its capital, St Pierre. Scientific evidence is against him, the Commander of the U.S. Base refuses to evacuate, and Wyatt's lone…