Remy is in the middle of a zombie apocalypse. She was in a "safe area" but it was recently overrun by zombies who have come together in a large group and may even be working together.
She gets out, but loses contact with her brother who was shuffled to another "safe area". Remy starts trekking across the US to travel back to him picking up a ragtag bunch of survivors along the way. Including a lion. Seriously, a lion.
I enjoyed it overall, but didn't love it. The ending was a good twist so I may continue.