There are four people of librarians: Eve Baird, who is chosen by The Library to be a new Guardian, as well as Ezekiel, Cassandra and Jacob. They set off on adventures in an effort to save mysterious, ancient artifacts.  Things go from bad to worse, however, when the Librarians figure out the Brotherhood’s ominous endgame – to introduce magic back into the world byre-inserting Excalibur into its Stone sheath, which is hidden in a secret chamber underneath the heavily guarded Buckingham Palace. If they fail, the world will be plunged into a new Dark Age. But if they succeed, they will become the new LIBRARIANS.