In Toronto, a group of friends and family prepare for the end of the world, expected at midnight as the result of a calamity that is not explained, but which has been expected for several months. There has been panic and rioting after the imminent catastrophe was announced, but the chaos has since largely died down, with only sporadic murders and robberies. On the last evening, depressed widower Patrick meets with his family, including his sister Jennifer, for a mock Christmas dinner and celebration, though he leaves prematurely to spend his final hours alone in his apartment. He unexpectedly meets Sandra, who is stranded in the city and attempting to reunite with her new husband Duncan, who works at a power company. Duncan spends much of the day calling his customers to reassure them that their heating gas will be kept on until the very end. Sandra and Duncan have a suicide pact. Although intending to die alone, Patrick invites Sandra up to his apartment and attempts to help her find her husband.