Super-smart kid inventors Nick and Tesla Holt have outsmarted crooks, spies, and kidnappers. This time they attempt to crack their biggest mystery yet: where the heck are their parents? With the help of their eccentric Uncle Newt, the twin sleuths trace the clues to their missing Mom and Dad, scientists who've been working on solar power reserch for a clandestine government project. But they'll need all their wits, and an assortment of homemade solar gadgets, to outsmart the criminal mastermind who's trying to turn solar power into a secret weapon.
