The Angel's realm (On Hold)

Ariana's father disappeared on her 5th Birthday. Leaving her a book of stories. When she reads the words on the page, strange voices are heard and she is lead into a different world. One where magic once was practiced everywhere, where people would dance with joy, where life was like a dream.
Now, the most powerful creatures, the Angels of the realm are in hiding and the world is going into chaos. From pure joy to bitter dismay, Ariana is everyones new hope for humans and elven life.

But how is she tied in? Has her fathers disappearance to do with this?