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The name’s Chase Cooper, and this is my 10th diary as a 6th grade ninja. If I had a penny for every time trouble came knocking at my door...I’d have 10 pennies. A few days have passed since the green ninja clan appeared, but that's more than enough time for them to give me a headache. It doesn’t help that my attention is stretched between a crazy robotics competition, an annoying pirate poser, and the ex-leader of the red ninja clan.

Jimmy Roberts' favourite sport to watch is Robot Races, where drivers and their high-tech robot vehicles compete. When the races' founder announces a special version of the competition just for children, Jimmy and his robot, Cabbie, were thrilled to qualify. After finishing second in the first race, they're out to win the next challenge, in the Amazon rainforest - but Jimmy's enemy Horace has other ideas.

Jimmy Roberts' favourite sport to watch is Robot Races, where drivers and their high-tech robot vehicles compete. When the races' founder announces a special version of the competition just for children, Jimmy would be the first to sign up - if only he could afford his own robot. However, his grandpa's shed holds a few surprises! Soon Jimmy is off on the adventure of a lifetime.