In Under a Graveyard Sky, Faith and Sophia spend some time on Manhattan helping out their uncle Tom Smith. This book is the full story of how Tom and his security team at a major Wall Street bank handled the zombie apocalypse, from the first reports to the total collapse of civilisation.
Far from just filling out the story of a side character, Mr. Ringo and Mr. Massa tell a compelling story, firmly establishing Tom Smith as a major protagonist in his own right. While he naturally shares character traits with his brother Steve, he is not a carbon copy.
The story takes place against the backdrop of Wall Street, and the authors have really captured the feeling of the environment. Investment bankers tend to be smart, driven, and analytical. The response to a zombie apocalypse is rational, but also mired in internal politics. Inevitably, the situation devolves, meaning more action and less analysis, but that is not a bad thing. The action scenes are excellent and some of the ZAMMIEs (Zombie Apocalypse Moments) are hilarious.