This is not a story in itself. It is only the beginning and does not conclude even a substory by itself. I do neither appreciate being forced to invest more just to see a story coming to an end nor the pervasive slang used in this book. Likely, the use of slang aspires to connect with the kids, but given the eventual length of this story it just turns out to be annoying. Given the fact that slang is necessarily more of a linguistic fashion than the more guarded "host" language, this book is unlikely to become a cult. It's better that way as the story itself could be more imaginative as even my son could quickly abandon the story for another.
Not even Katharina Thalbach, who is always a boon for every story she dedicates her attention to, can save this book. Sorry.