Okay, so where do I start with this? 
 I was intrigued by the get go as soon as I saw this book. The cover is simply amazing, and powerful as well. Then, when I read the summary of it and the first couple pages, I knew it would be amazing and that I would have to read it. And I'm so glad I did. In What's Left of Me Kat Zhang crafts a simply wonderful world so seemingly similar to our own and yet at the same time so incredibly different. The basis for this novel: Every body is born with two souls. One soul eventually fades, usually by the age three, four, or five, and the other soul, the dominant one, goes on living their life as a single soul inhabiting a single body. Or at least that's what's supposed to happen. There are some flaws in the system, some hiccups, in which on of the souls doesn't fade, and the two souls never settle, leaving two souls to inhabit one body, as is the case of Eva and Addie. But being a hybrid, as it's called, is incredibly dangerous. They're seen as threats to society, and hybrids will be captured and imprisoned for the rest of their lives if they are ever found out. Addie and Eva have lived their lives in secrecy because of this, but when a series of events fall into place, Eva (after not moving her body for three years) is given the opportunity to move, laugh, and speak, and as she and Addie go deeper and deeper into getting Eva to be able to move again, trouble ensues and they are launched into conspiracies, circumstances, and a battle between right and wrong that they had never believed to be even remotely possible. 
 That's all I can say without giving anything away. Just know that this is an absolutely wonderful book, and fully deserves your time and attention.