Full review can also be found on: Paein and Ms4Tune's Book Blog 
 I really enjoyed this story! It was exciting and, unlike the other novellas, didn't seem to drag. What happens is something I'd have been concerned about, if this was me. Two powerful people from 'opposing' sides being used against each other. It was nice because we had Lief's point of view for the first time! And there was some Valek and some Janco in there too. We travelled to places we haven't been and met new people! And I really want it to snow here. 
 It's set when Yelena is 23, Fire Study was when she was 21 and Shadow Study seems to be set when Yelena is 27, so there's a big gap still. (but then I guess the glass series fits in after this?)This also comes with a nifty timeline at the end. 
 I'm most curious about the school of Night and Shadow!!!! Please can we have a book about this? 
 It also details the exact age gap between Valek and Yelena. I knew it was a big one, but it's never seemed so. It also makes me really wish I'd read the glass books, I've forgotten any input these two had.