Autumn is bearing down on Alaska, and the Keefer Brothers are embarking on another unpredictable north-country adventure. The stakes are higher than ever as the September winds of change threaten to choke the landscape with ice and snow. The Brothers are forced to match wits with Mother Nature with very limited gear. They've been "Dropped" with nothing but the clothes on their back and the sidearms on their hip for last resort predator protection. Supply yielding caches have been placed at predetermined locations along the way. The rules are simple; find and validate each cache on time, or lose its contents forever. Chris and Casey are forced to dig deep as they raft through mile after mile of rocky river, keeping their eyes peeled for enough scraps to survive along the way. The clock is ticking.