Book one of the Secret Library series.
All libraries are magical. Some libraries are more magical than others.
For Alex Reed, the world is an awkward place and books are her only escape. But when she is selected by a mysterious library to be its new Keeper she discovers that some books can be a lot of work.
Now Alex must balance her new adventures with the incomparable obstacles of being an anxiety-riddled teenager. All this would be completely doable, if only Hank would do as he was told.