40-year-old Amelia who is hit by a bus on her birthday. When she wakes up, she suddenly finds the year is 2002 and Amelia is 18 again - allowing her to right all the mistakes she made the first time round.But as she finds herself stuck in a "Groundhog Day" time loop - waking up every morning on her 18th birthday - she realizes there's something else going on that will need to b...。故事围绕一个家庭展开,家庭的主角是一对母子,他们躲在地堡里幸存了下来变成了地球上最后的人类家庭,可是导致世界末日的缘由来源于他们二十年前的所作所为。。