Temptress Desirée Le Mire and brothers Paul and Harry Lamar are searching for a lost treasure in a mysterious cave in the Andes. They encounter Inca deformed by living underground. What ensues is a tornado of an adventure underground by Rex Stout; featuring heroic acts, lucky escapes, battles of will and physical power, feats of daring and strategy; as the heroic trio tangles with the Inca's (of which the chief has taken a fancy to the beautiful Desirée...)