Sarah & Katy and the Book of blank

"Sisters Sarah and Katy discover a book bearing nothing but blank pages and a mysterious warning: Once you turn the page, there's no turning back. They turn the page anyway and find themselves transported into the book. The only way to escape is to fill the blank pages with their imaginations and travel to the end of the book. But soon they realize: Once they bring an idea to life on the page, it takes on a mind of its own."--Provided by publisher.