Nick and Tesla's Solar-Powered Showdown: A Mystery with Sun-Powered Gadgets You Can Build Yourself (Hardcover) by Pflugfelder Science Bob Hockensmith Steve
Super-smart kid inventors Nick and Tesla Holt have outsmarted crooks spies and kidnappers but now it's time to crack their biggest mystery yet: where the heck are their parents? With the help of their eccentric Uncle Newt the twins trace the clues to their missing Mom and Dad scientists working on solar-power research for a clandestine government project. They'll need all their wits along with an assortment of homemade gadgets to outsmart the criminal mastermind who's trying to turn solar power into a secret weapon. Featuring instructions for building and using five awesome solar-powered contraptions-a hot dog cooker alarm bell listening device model car and nighttime LED signal cannon-this sixth installment is sure to please budding scientists and sleuthers alike.