The magic book

There once was a magical book in the library that was hidden from everybody, until one day,Sarah picked up the book,thinking it was a journal.When she opened the book,there was a mighty wind,then suddenly, she was back in the time of David and Goliath.Sarah was watching as David threw the stone that killed the mighty giant.She was invisible to the people in the past.The book was then opened again and she was in the year 1776 when the Declaration of Independence was signed.This time she wasn't invisible,but was disguised as Benjamin Franklin!Suddenly,the book was bright green and the book took her back to the library where she was unconscious from a book falling off the shelf.She told Gabrielle what she had experienced,but she didn't believe her.The magical book was actually a time machine that takes people to historical events in history