I like how much the sisters have grown and learned, expanding their powers and travelling to new places. I felt like the gloom of their dire situations dragged on a bit, but the epic battles at the end were definitely worth the wait. It would be nice to have more explanation as to what's going on around them and how each of their powers work, but we're gliding in the dark along with them, I suppose. They just know so little about the world, magic, history, etc. from their sheltered upbringing that it is very frustrating at times for the reader to not understand what's happening. I hope we get more explanations soon now that they've come into their own and have joined the wider world. Again, I wish there had been more interactions between Sanna and Isadora - this being a book series about sister witches with monumental destinies and all - but they were doing their own things for most of the book. Please oh please have more scenes together in the last book!
Maturity rating: high school and up. Not much to speak of with romance, swearing, or drugs, but violence is pervasive. Lots of dragon blood, injuries, loss, torture, threat of war, and imminent doom. Not too graphic, but it can get a bit heavy.