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.

The Smith family, and the few stalwarts of the Wolf Squadron, continue their campaign to reclaim the Atlantic Ocean from the zombified humans one ship at a time. So far they have pulled a few hundred people from small ships and lifeboats. Then the difficulty of rescuing those trapped on a superliner cruise ship compels what remains of the USA's government to take action. They authorize a submarine to provide necessary equipment and in the process reveal that they have been shadowing the ragtag fleet for a few weeks. The survival of a few submarines is good news, but they have an ulterior motive. Without a vaccine the thousands of crew members on those subs will die. 

The Smith family prepared for every eventuality including a zombie apocalypse, although that was mostly for entertainment purposes. So when Steve Smith, husband, father of two teenaged girls, and high school history teacher receives an Alas, Babylon code from his brother indicating an actual zombie apocalypse he calmly informs the school of a family emergency and walks out. Someone has engineered a virus that causes people to strip naked just before they lose all higher brain function and are reduced to basic animalistic urges. While most of the world is trying to contain the growing population of naked maniacs the Smiths load up a sail boat and work with a team making an ethically questionable vaccine. After a couple of months at sea they're running low on supplies so they board a slightly larger ship and eliminate the remaining "zombie". They also find a terrified teenager barricaded in her cabin which sparks something in the Smiths. They have guns and the guts to clear the Atlantic of zombies one ship at a time and save as many people as they can.