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Summer break is about to get weird. After their parents disappear, twins Nick and Tesla are sent to live with their Uncle Newt, an eccentric invent...

Summer break is about to get weird. After their parents disappear, twins Nick and Tesla are sent to live with their Uncle Newt, an eccentric invent...

Bright siblings-and amateur inventors-Nick and Tesla Holt are back in this fourth instalment. With the mystery of the spy's identity solved, the ki...

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: ...

In this second novel of the Nick and Tesla series, the precocious brother-and-sister duo find themselves solving another baffling mystery. As the s...