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It is about a story in which Henry McThrottle, a fifth grader, and his friend look for their principal's long-lost treasure after getting into trouble with his enemies, Fred and Clive Durkin. They steal a lollipop that he had won by answering a difficult maths question, and Henry trips over them. Then Mrs Cross comes and sends him to Principal Greenbeard's office, despite the fact it was an accident. It is only then when Henry finds out about the treasure.