Extreme weather threatens Europe. When France calls on Mortimer to help solve this enigma, he goes to visit Professor Labrousse, chief French meteorologist. After the driver Labrousse sends to pick up Mortimer disappears, our friend is the prime suspect. Mortimer contacts Captain Blake to help him with this tricky situation. Then Blake disappears. Mortimer and Labrousse have two missing-person cases to investigate. They soon discover that the disappearances are linked to the climatic catastrophes.