This is fairly well-written in that the words themselves are put together well. The tone is consistent, the voice entertaining, and I enjoyed the resourcefulness of the main character. The world the book depicts is also a fascinating one - the final struggle after an alien invasion, a biological seeding that transforms the bodies of every living creature on Earth. But one of the through-threads concerning Callie's dad is so monumentally unbelievable that it sours most of the book for me, a situation not helped by world-building inconsistencies and even the odd mistake. Granted, this is only the first volume in the series (it ends on a cliffhanger) and so this might mostly be cleared up in later volumes, but I'm not a particular fan of that kind of handwavium. Each volume of a series should make sense on its own merits, and although there's some really enjoyable things in here it ultimately doesn't make enough consistent sense for me.