What are the mysterious lights flitting above Oswego Lake on moonlit nights? Marsh gas? Ball lightning? Or holdovers from the dawn of Creation? When Jonathan Oliver makes it his homeschool project to track down the source of the Lake Lights, his search leads him to Iron Mountain's abandoned Prosser mine and its prehistoric secrets. After his brilliant father, Matthew Oliver, goes missing, Jon is left to decode a cryptic message leading to a remarkable invention. With his grandfather's help, Jon tries to outwit his father's former business partner, who will stop at nothing to steal the device...