While I didn't think Magic Study was quite as good as Poison Study, I have to say it was still one hell of a ride and a great continuation of the story. 
 Yelena's decisions are a lot more questionable compared to Poison Study, but I still found her sympathetic and overall likable all the same. She also is a bit OP at times, but I'm willing to forgive it because I love her so. 
 The plot is fast paced and remains gripping throughout the entire book. The new characters are great additions to this world. The magic system is a little woo-woo, but makes overall sense and didn't strike me as an ass pull. 
 However, my favorite thing about this book is Yelena and Valek's relationship. I am SO glad she remained so loyal and faithful to him and they are so friggin' adorable together. I find it's rare that an author can pull off having the main couple get together and keep them interesting without pulling tons of annoying stupidass bullshit. This book gets it right. They are two complimentary pieces and I found myself squeeing at every scene of them together. Valek can get overshadowed by Yelena, but he's still very much his own distinctive self and the whole thing is very swoonworthy. I approve! 
 This one is very much worth reading if you read and enjoyed Poison Study.