After a family tragedy, three generations of the Deetz family return home to Winter River. Still haunted by Betelgeuse, Lydia's life is turned upside down when her teenage daughter, Astrid, accidentally opens the portal to the Afterlife.
In World War II London, nine-year-old George is evacuated to the countryside by his mother, Rita, to escape the bombings. Defiant and determined to return to his family, George embarks on an epic, perilous journey back home as Rita searches for him.
Having found the safety of the Greenland bunker after the comet Clarke decimated the Earth, the Garrity family must now risk everything to embark on a perilous journey across the wasteland of Europe to find a new home.