John T. Unger makes a fair number of friends at boarding school, but Percy Washington is by far the strangest boy he has met. Percy invites John to stay at his house for the summer, and when John accepts, Percy boasts about his family's wealth, claiming that his father has a diamond bigger than the Ritz Carlton Hotel. But Percy's strange behaviour and outlandish claims are just the first in a mysterious chain of events, the start of which dates back all the way to the days of George Washington.

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