The Last Tribe by Brad Manuel

Imagine being alone in the world, one of only a handful to survive a global pandemic. Not only do you struggle to find food, water, and shelter, you deal with the sadness and loss of everyone you know, and everything you have.
Fourteen year old Greg Dixon is living that nightmare. Attending boarding school outside of Boston, he is separated from his family when a pandemic strikes. His classmates and teachers are dead, rotting in a dormitory turned morgue steps from his room. The nights are getting colder, and his food has run out. The last message from his father is get away from the city, and meet at his grandparent’s town in remote New Hampshire. Knowing the impending New England winter could be the final nail in his coffin, he packs what little food he can find, and sets off on his one hundred mile walk north with the unwavering belief that his family is alive and will join him.
As the fast moving and deadly disease strips away family and friends, Greg’s father, John, is trapped in South Carolina. Roadblocks, a panic stricken population, and winter make it impossible for him to get to his son. John and his three brothers appear to be immune, but they are scattered across a locked down United States, forced to wait for the end of humanity before travelling to the mountains of New Hampshire.
Spring arrives, and the Dixons make their way north to find young Greg. They meet others along the way, and slowly form the last tribe of humanity from the few people still alive in the northeast.