What things about the book did she find strange?

Question: What things about the book did she find strange?

The strangest thing about this book, according to Tom and Margie, was that the book was not turning the pages on its own, that is, the slides were not coming. He found this to be the strangest thing because the books he reads automatically turn pages. Then he came to know that this book belonged to his grandparents, which he used to read during his school days. With the help of this book, he also got information about many years and he also got information about his past.