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i know about Silver Key, the girl said. i m here to help you get your next power. Max has been waiting all summer for a clue that will tell him how to get his next superpower. When a mysterious girl turns up, things begin to move very fast! Who are the Guardians and where are they? What danger is lurking around the Silver Rock hide-out? And can Max find out before it s too late? With his sister Bea and best friend Corky in tow, Max must find the Guardians, get his next power and with the help of a friendly whale, save the Silver Rock from a gigantic slimy villain ! .