A New York couple and their Midwestern friends find that drastic changes have occurred in their respective lives since they last met.

The California coast is terrorized by two enormous prehistoric sea creatures as they battle each other for supremacy of the sea.

A dying professor leaves his great-nephew a collection of documents pertaining to the Cthulhu Cult. The nephew begins to learn why the study of the cult so fascinated his grandfather. Bit-by-bit he begins piecing together the dread implications of his grandfather's inquiries, and soon he takes on investigating the Cthulhu cult as a crusade of his own.