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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...

In this third installment of the series, 11-year-old whiz-kids Nick and Tesla discover that someone in the quiet town of Half Moon Bay has placed t...