Gibson is an exciting portrayal of contemporary life on the prairies of central Montana and is set against themes of mystery, discovery and the seeming randomicity of events in an indifferent world. The story concerns the discovery of an enormous cave system by two men of dissimilar character and upbringing that leads both of them to a fated sense of allegiance to one another--a relationship that becomes stressed to the breaking point by jealousy, mental illness and the often violent and uncontrollable forces of nature.