During the past year, a room had been added to the house and this was used as a library and sort of office combined, being provided with a substantial safe and two roller-top desks. One of the desks was used exclusively by Anderson Rover for his private letters and papers. When sick the man had given Dick the extra key to the desk, telling him to keep it. The father trusted his three sons implicitly, only keeping to himself such business affairs as he thought would not interest them.
The boys sat down and, led by Dick, began a careful inspection of the many letters and documents which the roller-top desk contained. A large number of the papers and letters they knew had no bearing on the affair now in hand. But presently Dick took up some letters of recent date and scanned them with interest.

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