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.

John Garrity, a Scottish structural engineer, tries to reconcile with his estranged wife and prepare for a party to watch a passing comet. However, when a series of comet fragments threaten Earth, John and his family must navigate chaos, looting, and a race against time to find safety. Along the way, they encounter kidnappings, military conflicts, and desperate attempts to reach a military base for evacuation. Despite the challenges, they refuse to give up and ultimately reunite and make it to a bunker in Greenland, where they join other survivors as Earth faces global destruction.