This was entertaining, but what kept me from investing in the rest of the series was Cassy. Instead of getting home as quickly and safely as possible, she did things such as slowing down to hunt for food ( I mean really, she’d only been without food for a matter of hours or something like that ), looting a store where she had been warned off, and just basically seeming to run around camping in the woods instead of focusing on walking the last miles home. This woman seriously needed some ADHD meds. I did enjoy the story with the grandmother and children as well as the invasion aspect.