A wealthy man named Richard Ellis had been counting his money. When he finished, he accidentally left a $100 bill on his desk. But when he returned for it a short while later, it was gone.
Only two other persons could have seen the bill. One was the maid; the other was the butler.
The maid told Richard that she had hidden it for safekeeping under a green book that was on the desk. But when they looked, the bill was not there.
The butler said he had found the bill where the maid had left it. He had placed it inside the book, where he thought there was less chance that somebody would find it. He had written down the page numbers so that he would not forget them. The bill was between pages 35 and 36, he said. But when they looked, there was no money in the book.
After Richard had talked to the maid and the butler, he called the police. He was sure he knew who had taken the money. Who was it, and how did he know?
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