Uncover a secret agent and build spy gadgets with twin sleuths Nick and Tesla in this zany, action-packed middle grade adventure by "Science Bob" Pflugfelder After rescuing a kidnapped heiress and taking down a robot army, 11-year-old twins Nick and Tesla could really use a break. But before they can kick back and relax, the young sleuths discover there's a spy in their midst Someone in the town of Half Moon Bay is spying on their...