A singer stranded in Panama moves in with an ex-soldier and his hypochondriac roommate; she and the former fall in love, but their romance is threatened by work and the arrival of an old flame.
Some shady characters discover that a sad sack nightclub bus boy has the ability to predict outcomes of races and other events through astrology.
When a man-eating cave creature appears with a fortune in uncut diamonds around his neck, Dr. Chambers' daughter Denae hires adventurers C & C Salvage to find the underground source of the gems.
An old Gothic cathedral, built over a mass grave, develops strange powers which trap a number of people inside with ghosts from a 12th Century massacre seeking to resurrect an ancient demon from the bowels of the Earth.
