The Dead Brother's Vengeance,Rise of the Zombie King

After the zombie apocalypse broke out, a freak accident gave my brother and me immunity to the virus—and the ability to command the undead.

My brother cared about humanity. He revealed his identity to save Muriel Maxwell, a Recon Squad captain who'd been infected with the zombie virus. In return, Muriel hailed him as humanity's last hope and welcomed him into the Bastion with the highest level of protection, swearing her undying loyalty.

I stayed outside the walls, leading my horde in circles for three days until I was sure he was safe. Then I left.