The Salt Wind

Ninety miles of salt crust lie between Arturo Vargas's convoy and the far shore, and the rains have come three weeks early. One night shortcut ends with a truck under the brine, a boy drowned, and eight survivors stranded on a flat that is turning to slush beneath their boots. No radio. No road. Fifteen gallons of water. Their only chance is a machine nobody has ever built — a sail, three wheels, and a wind that blows one way.