It has a fantastic premise. I love the idea of the library - the idea of the regular collections as much as the special ones, like the Grimm Legacy and the Lovelace, etc. Such a brilliant idea and magical. So, while I loved the setting, the characters were a bit flat and the plot felt sort of twisted up. There were a lot of elements that did not make sense. Still, overall, I enjoyed it and would recommend it for kids 11/12 +.
Both the US and German covers are perfect for the books:)
(I had a nice, very logical review typed up and then it was lost. Alas.)