This is the first book I've read in awhile that really surprised, shocked, and blindsided me. Aliens want Earth, without us on it, and very few have survived. Cassie is among those who are still alive and fighting. She could be your daughter, sister, or best friend. She was real and raw and completely engaging. This book had me reading while cooking, during lunch breaks, and any spare second I could find. I was transformed, sucked in and lost and loved every minute of it.