Kid inventors Nick and Tesla Holt have outsmarted crooks, spies, and
kidnappers. Now they have to crack their biggest mystery yet: Where the
heck are their parents? To outwit the criminal mastermind who's holding
their parents hostage, the twins will need all their brainpower, the
help of their eccentric Uncle Newt, and an assortment of homemade solar
gadgets. Will the Holt family be reunited at last? Or will a hijacked
solar satellite beam down doom from the skies? The adventure includes
instructions for creating a solar-powered hot-dog cooker, alarm, secret
listening device, and model car, plus a nighttime signal cannon that
fires illuminated ping-pong balls.