What do you do if you are one of the few who remain alive after a mysterious, flu-like virus claims most of the global population? This is a question Kim Robins and Peri Henderson have to answer when the world changes and society falls apart. Violent gangs of looters make it unsafe to remain in the city. Hoping to improve their chances for survival, Kim and Peri decide to hike into the remote forest area of Maine. Dangerous circumstances along the trail cause the women to join forces with another hiker and her dog. The longtime friends and their new companions set off on a daunting trek filled with both menacing and kindhearted survivors. With evidence of the illness everywhere they go, will this journey bring each of the women the happiness and safety she seeks?