The Blue Book of Nebo takes place in post-apocalyptic Wales. A mother and her teenage son, the only survivors of a mysterious explosion, are trying to survive in their rural home, in a world where death is in the air, and no other people remain. At some point they find an empty journal with a blue cover in a neighbor’s house, and decide to document their lives in it. Both of them are stern characters, they don’t share much with one another, but they share with the blue book.