Twins Page and Turner know about the magic a library holds--they've been going to their beloved New York City public library for years, especially since their parents are always traveling for work.

But a secret mission involving their dad's rare and valuable edition of Bram Stoker's Dracula uncovers a world they've never known, featuring a mysterious Night Librarian, famous heroes (and villains) that have broken free from classic books, and an epic battle to save the library from total destruction.