Dad always said if things get desperate, it’s okay to drink the water in the toilet. I never thought it would come to that. I thought I’d sooner die than let one drop of toilet water touch my lips. Yet here I am, kneeling before a porcelain throne, holding a tin mug for scooping in one hand, and my half-gallon canteen in the other.

The Lockwood brothers are supposed to be able to survive anything. Their dad, a hardcore survivalist, has stockpiled enough food and water on their isolated Nevada ranch to last for months. But when they are robbed at gunpoint during a massive blackout while their dad is out of town, John and Stew must walk 96 miles in the stark desert sun to get help—and they have only 3 days before their time runs out....