Most people have to wait until they're seventeen to enlist in the military but due to the zombie apocalypse Faith and Sophia Smith find themselves officers at ages 13 and 15. As the Wolf Squadron fleet begins searching for the resources necessary to manufacture a vaccine for the zombie virus, both sisters discover that there is more to being an officer than shooting things. With an assault on Guantanamo Bay in the works and a mission that's literally from out of this world, it's time to move past the sibling rivalry and learn to work together. After two books of Smith vs Zombie mayhem, Ringo keeps the formula fresh by dividing the focus more evenly between Faith and Sophia and pushing the characters out of their comfort zones.