Following on from Shadow and Bone, this book sees Mal and Alina fleeing Ravka, but their freedom is fleeting. Alina is unhappy, and covering up her Sun Summoner powers takes its toll. The Darkling emerges with a frightening new power. We meet a fabulous new character, Sturmhond, a privateer who turns out to be so much more. There are complications between Mal and Alina, between Alina and Sturmhond and between Mal and Sturmhond. This is not exactly a love triangle, but it is a triangle and it’s developed quite well (though Mal spends a fair bit of time being an arse in this book.) It’s all about the search for amplifiers that will increase Alina’s power an enable her to defeat the darkling and reverse the big nasty darkness that splits the land.
I can’t say much more without spoilers. The whole Grisha trilogy is one story served up as three books, rather than three standalones. I recommend reading all three together.