The arrival of a party of aliens from a distant world would arouse mixed feelings in the mind of any human witness involved. But if the strangers prove to be the advance party of a gigantic global migration scheme most human beings would almost certainly be afraid. Hardly surprising, therefore, that Mike and Jay, caught up in the mesh of just such a situation, were two very frightened people. But they were also on the brink of the most fantastic adventure ever woven around the lives of ordinary mortal beings...