As drought and the Depression threaten to destroy her family's South Dakota farm, twelve-year-old Christine discovers a wondrous cave, which becomes both her own private delight and a possible salvation for the family.
Discusses aspects of caves: their formation, structure, wildlife, and vegetation. Includes the history of several well-known caves and exploration advice.
When Joe stumbles upon an uncharted subcavern while he and Frank are exploring caves in Kentucky, they find themselves attacked by a fellow explorer, caught in a whirlpool, and snared in a booby trap.