In every generation on the island of Fennbirn a set of triplets is born; three sisters, all equal heirs to the crown and each the possessor of a coveted magic. Mirabella is an elemental, Arsinoe is a naturalist and Katharine is a poisoner. But only one Queen may be crowned. Separated as children to be taught to harness their gift the sisters know that one day they will come face to face again in a violent battle to the death. The last queen standing will reign. 
 I've got to say, I utterly loved this book. It is dark and compelling and wickedly imagined; a story of magic and alliances, politics and power, revenge and betrayal. A story of sisters, pulled apart by fate yet irrevocably connected by a shared curse. There is something so mysterious and sinisterly atmospheric about this world, a palpable undercurrent of tension and danger that suffuses the pages and draws you deep into the story. I literally could not put it down. 
 The world-building in this book is honestly kind of phenomenal and so intriguingly complex. The use of multiple alternating viewpoints throughout the book enables the author to thoroughly explore and flesh-out this vivid and darkly enchanting fantasy world, drawing so many layered and unique elements into the story. I loved exploring this world, I loved the atmosphere and the tension, the slow burn build-up towards an absolutely evil cliff-hanger. While the pacing may not be for everyone, I really enjoyed the freedom it allowed to focus on the world-building and enhance the characterisation. 
 And honestly, all of the characters are beautifully complex, distinctive and well developed. The author does a fantastic job of slowly weaving together multiple convergent story arcs, exploring each characters viewpoint and life, as well as their role in the wider narrative, in a way that felt richly detailed and deliciously authentic. This nuanced characterisation ensures you can't help but connect to, and ultimately sympathise with, each sister in turn, pulling your loyalty in multiple conflicting and heartbreaking directions. This aspect really helps add to the tension and tone of the story, keeping you hooked until the very last page. 
 When you couple such a fascinating premise with some truly incredible characters and intriguing world building it's easy to see why this fantasy is one of my favourites of the year. I can't wait to get my hands on the sequel! 
 Actual rating 4.5 stars. 
 Disclaimer: I received a free unsolicited copy of this book from the publisher in exchange for an honest review.