I DNFed this book at 50% and could not bring myself to read on. I was extremely confused by the world building, I really wanted to me immersed by the danger of a dystopian world plagued by mutant creatures, but how this world was presented in the book did not capture my attention. I felt that there was an excessive amount of time wasting right after Lane left the wall, and I was extremely bored by what follows afterward to the time she finally escaped from the soldiers. 
 I truly found the idea of the mutant human/animals confounding. They are an improbable concept in science, given the slow manifestation of mutation in nature, even if helped along by disease or radiation. This concept might have been explained more further along, but by the time the were-lion appeared in the book, I found myself bursting into laughter. The book did not improve subsequently, and I am forced to admit defeat and call it quits. 
 I received an Advance Review Copy of this book from NetGalley.