In a post-apocalyptic adventure in the Swedish archipelago, a science team struggles to find a way to protect the few surviving humans from a lethal mushroom organism. Forced on a journey through the wilderness to find a new bunker in which to continue their research, they come into conflict with an armed gang that uses a drug to delay the effects of the organism. The scientists want to find a more permanent solution, and have to fight for the very survival of humanity.
Sam decides to stop pursuing charges against her rapist and spend Thanksgiving alone on her family's Virginia farm. Her brother stages an intervention with seven of Sam’s friends to persuade her to return.