For Callie Summers, life after the super solar flare and deadly viral outbreak can be summed up in one word. Alone. Having lost everyone she loved, Callie travels on foot to her family's remote hunting cabin, where her father stockpiled food and supplies for this type of situation.
Along the way, she meets Noah Hill and Ethan Erikson, a couple traveling the same direction. Callie struggles with her attraction to the pair until they make it clear they are just as interested in her.
With Noah and Ethan, Callie is no longer alone but can she bring herself to trust them in this new world where everyone is trying to survive no matter the cost?