The Ant King: A Humorous Apocalypse
Luke left the relative safety of Fallout Shelter 17 in search of food and water for the commune. He never returned.
Three months later the commune's counsel has ordered his son, Samuel, to retrace his footsteps and find sufficient provisions for the shelter to survive another winter.
During Samuel's travels he comes across the strangest - and perhaps the wisest - man the bombs left behind.