Sassafras and Alcatraz are twins who couldn't be more different, except for the fact that they love their local library and their mother is best friends with the librarian. They sit in the library while their mother coaches their older brothers football team. The librarian, Ms Burns, tells them the Mayor is going to demolish the library to make way for a car park and there is nothing she can do about it. When Sass goes down to the basement for the packing boxes, she puts her hands on the old library files that hold the Dewey Decimal Cards and something magical happens. She calls the characters of the books to life. The library is helping them to find a way to fight. Can they find the right combination of characters, including the knights, pirates and scientists, to stop the council and save the library?