The Sword of Danu by Christine Norris
Just when everything was under control…
Megan has embraced her role as the Librarian, protector of the Library of Athena. She’s spent her entire summer teaching herself magic (al though it doesn’t always work out the way she wants) and studying the Library’s secrets. The Order of Ares, an organization bent on stealing all of the Library’s artifacts, are always at the back of her mind, though they’ve been quiet for awhile.
Then she is forced into yet another enchanted story. Or rather, the story comes to her, somehow ripped from the pages of the book and brought to life. She and her friends must fight their way through an imaginary Ireland, where danger lies around every turn, and find the mythical Sword of Danu.
It’s a race against time—because the magic is spreading. The manor is being overrun, and Megan, Rachel, Claire and Harriet must fight through what was supposed to be an imaginary world to find the sword and return things to normal.
The Library of Athena Book 4