This review originally posted at More Than Just Magic 
 Undone is a complicated story - it's about grief, it's about friendship, it's about death. It's a little bit revenge plot, a little bit melodrama. But it is 100% captivating. 
 Jem's best friend in the whole world, Kai, has committed suicide after he is outed to the whole school. Confused, alone and not sure how to carry on, Jem decides that she is also going to commit suicide, but only after she finds out who was behind outing Kai and only after she gets her revenge. To do so she needs to infiltrate the popular group and figure out the best ways to hurt them like they hurt Kai. 
 This book might be a tough sell to some readers because Jem and Kai are complicated (or unlikeable) characters. Jem is not a sentimental person. She loves Kai, but everyone else? She could take them or leave them. Combine that with the anger, grief and bitterness and you have one unpleasant girl. At times she really frustrated me but I can't begin to imagine what it's like to lose your best friend so suddenly and without warning. I think her attitude was completely warranted given the context, and as you keep reading, her dry sense of humour and sarcastic wit really start to grow on you. 
 Kai I had a harder time figuring out. I wish the reader was given a little more time with him before he committed suicide, and given a better sense of his personality and where he was coming from. Most of the reader's encounters with him are through his letters. The letters were filled with tasks for Jem - to dye her hair, to buy a top at a store she hates, etc... Though it was clear he meant well by them, they actually made me dislike Kai more and more as the novel went on. If he was her best friend and only wanted her to be happy, why did he want her to change so much about herself? Thankfully, after some time the novel became less about the letters and more about Jem and her dealings with 'Team Popular.' 
 I really appreciated that Undone wasn't afraid to dig in deep and address more sensitive subjects - bullying, suicide, sex, drinking, rape.... It's a tough book. But they are all very real issues and Clarke handles them expertly. It's an emotional read that really draws attention to the problem of bullying - particularly bullying based on sexual identity - and how horribly it can affect people. Though you may not agree with all of Jem's decisions, I think it's easy to see where she's coming from and how she got to that point. 
 With its complicated characters, tough subject matter and revenge-focused plot line, Undone is far from an easy read. But if you give it a chance you'll find a dangerous, emotional journey that is both riveting and surprising. I highly recommend this book to fans of Courtney Summers and Laurie Halse Anderson.