Someday there would be a return to the forest, and to the reservoirs. It was a promise solemnly made.
Nigel Vern is trying to survive. Fighting hunger, thirst and cold, he is determined to find a way back to his life. As long as he can be spared the awkwardness of being rescued.
Meanwhile, Sarah, Nigel's daughter, is visited by her grandmothers. Together, they try to make sense of his vanishing act, starting by going on an expedition of their own.