When Roger Brenner leaves the house because he has the urge to take a walk, no one, not even him, realizes he is about to change the world as we know it.

Roger's sudden desire quickly turns into something more as both his mind and body begin to change. He is consumed by his need to keep walking, and soon he is leaving the small town of Rocky Point behind. By the time his family realizes he's gone, he's miles away and entering an altered state of consciousness.

As the days go by and Roger continues his unnatural journey, his body begins to deteriorate. He also attracts followers, all of them murmuring the same chilling words. The growing horde travels down the East Coast, growing in size every day.

In less than a week, the phenomenon spreads across the world, causing religious and political upheaval. The governments fear it's a disease. Religious leaders claim it's a sign of the apocalypse. And scientists say it's nature correcting overpopulation.

The same questions plague all of them:

When will it end?

And what happens next?

The world is about to find out.