Six Days to Die.

Parched, ragged, and dragging a heavy iron chain, a lone Gambler hobbles eastward through the endless desert. Barely a day behind him, a blood-thirsty Marshal in a priest's collar is exterminating everything in her path, hellbent on catching her prey. When the Gambler inadvertently rescues a young boy from a town gone mad, the boy sticks to him like glue as they escape together before the Marshal arrives to burn the town to the ground. But when the Marshal finally confronts the Gambler, he must make a terrible choice if he hopes to escape with his life.