A wristwatch-smuggling gang bring watches into the country in a car's petrol tank. Poor Zena Marshall knows too much, so the gangs abducts her. Stalwart customs official Anthony Steel struggles manfully to rescue the girl.
The work of Peter Ketley on Fisheries Research in Devon is being disorganised by a mysterious new method of salmon poaching. His young brother Bob, with the help of two children from London, eventually uncovers and catches the poachers.
An American investigator for the U.N., a German scientist and a British reporter join forces to investigate a series of disappearances and mutilation-deaths confined to a Swiss Alp and involving a thick, mobile cloud, a telepathic girl, an animate dead man, and tentacled, cyclopean beings from another planet.
