This is going to be a mini review, for real. So don't expect something long. It's more a rant about how much I liked this novel. 
 So, I read Shadow and Bone and I wasn't impressed at all. I didn't feel any russian atmosphere. Nothing. I liked it but the worldbuilding was quite... flat? 
 Anyway, whit this short novel, Bardugo has been capable to do what she didn't in a whole book - at least for me: I felt Russia. Totally. In my mind I was able, perfectly able, to see the world. Obviously, that's amazing. 
 The story looks like a retelling of Hansel and Gretel, but it's also a mix of folklore with creepy tints and something more darker - like human nature... but I said nothing. 
 The best part was definitely the end. THE END. No, really, it was so brutal and truthful that I nearly screamed. 
 Few things could have been more realistic - like someone telling the truth instead of hurting people - but it would have broken the whole atmosphere. 
 This novel has been able to give me anxiety, strenght, allowed me to empathize with the protagonist, and even loving the end in all its horror. 
 So: READ IT. 
 And this is one of the most delirant mini reviews that I've ever wrote.