Prepper James Hillcoat is preparing for the end of the world by building a shelter in the basement of his London home and stocking up on supplies. However, over time, the basement begins to seem unreliable to him, and after a disagreement with his wife, without her knowledge, he takes his eight-year-old daughter Peggy to an abandoned hut in the middle of a deep forest somewhere in Germany. Thus begins the story of their survival. The story of the last two people on earth, as Peggy thinks, because her father convinced her that there was no one else left in the whole world... Nine years later, Peggy returns home to her mother, but attempts to find out what happened in the forest lead to new mysteries.