At first, it looks like a disease. An epidemic that spreads through no known means, driving its victims mad with memories of a life they never lived. But the force that's sweeping the world is no pathogen. It's just the first shockwave, unleashed by a stunning discovery - and what's in jeopardy is not just our minds. In New York City, Detective Barry Sutton is closing in on the truth - and in a remote laboratory, neuroscientist Helena Smith is unaware that she alone holds the key to this mystery... and the tools for fighting back. Together, Barry and Helena will have to confront their enemy - before they, and the world, are trapped in a loop of ever-growing chaos.