I had several issues with this book. For one, how the author talked about "European" stuff. I was born and live in Europe, and quite frankly it annoyed me. Europe is not one homogeneous area, but rather a very diverse place.Secondly, I just could not get the worldbuilding. I was so excited because, well, Valkyries! However, the story did become unbelievable at times.Thirdly, the character arcs. I just could not believe Graham's arc at all, nor Ellie's.To end on a positive note, what saved this novel in my opinion was Tuck. What an amazing guy. Give me one of those, please.