Bill and Penelope are the lucky ones. Not only do they survive the Shark Flu emerging from the melting Icelandic permafrost to sweep like a scythe across the world, they begin to rebuild a life in the wreckage of the old. A garden to feed themselves planted where the lawn used to be, a mattress pulled down to the living room fireplace for warmth. Even Bill’s psychology practice endures the collapse of the social order, the handful of remaining clients bartering cans of food for their sessions. But when their daughter’s voice over the radio in the kitchen announces that she’s joined a cult 3,000 miles away in Bishop, California, they leave it all behind to embark on a perilous trek across the hollowed-out remains of America to save her.