The hollow skull

There is something wrong with some of the people of Madison. They look the same, they talk the same. The even seem to love the same. Yet late at night, when few are watching, they meet and talk among themselves. About the foolishness of people, and the end of the human race. They do more than talk, for these people are no longer really people at all. Something has entered their skulls, pierced their souls, and changed them into strange alien beings that have only one desire - to transform humanity into a nightmarish race that exists only to inflict pain.