"I suppose Hans would say that one of the Nisser had taken it," said Anna jokingly, when they had gone about halfway through the shelves of books.
"I wouldn't be at all surprised if one had taken it," answered Greta quite seriously.
They kept on looking for almost an hour. By this time Mr. Christianson was really worried. He finally called in all the servants and asked if any of them had been in the library that day. None of them had. The disappearance of the book had become a real mystery.
"I should hate to lose this book more than any other book in the library."
"Let's look once more on the shelf where it's supposed to be," said Anna.
Mr. Christianson laughed. "But we looked there very carefully when we first came in."
Anna wanted to look there again, so she ran down the long room to the special shelf.
"Here it is!" she shouted. "Right here on the shelf where it is always kept."
The others rushed up at once. "Well, this is strange," said Mr. Christianson. "It wasn't here an hour ago, and no one has been in this part of the room since then."
"Except maybe a Nisse," said Greta.