What if your life depended on a stranger? After an incoming storm forces the cancellation of her flight to New York, talented photojournalist Alex Martin finds herself stuck in Idaho the night before her wedding. Scrambling to make it home in time, she hits upon a longshot idea and charters a plane to Denver in the hopes of catching the red-eye to New York that same night. Another stranded passenger, Ben Bass, a skilled British neurosurgeon due back on the East Coast to perform a critical, life-saving operation, tunes out his own misgivings about the plan and joins her. As Alex and Ben fly ahead of inclement weather in a small Piper two-seater, their pilot suffers a massive stroke, and the small craft crashes in the deep snows of the Uinta Mountains in north-eastern Utah. Trapped in the remote region with little hope of rescue, the two weary travellers embark on a terrifying and transformative pilgrimage across the unforgiving reaches of the vast, rugged terrain, fighting against the elements, animals and time. Under the most extreme circumstances imaginable, they gradually learn to trust one another, and a powerful connection grows between them--one that will reshape the course of their lives.