When your average, 16-year old loser, Scott Tyler, meets the beautiful and mysterious Aubrey Jones, he learns he's not so average after all. He's a 'Shifter'. And that means he has the power to undo any decision he's ever made. At first, he thinks the power to shift is pretty cool. But as his world starts to unravel around him he realises that each time he uses his power, it has consequences; terrible unforeseen consequences. Shifting is going to get him killed. In a world where everything can change with a thought, Scott has to decide where he stands.

Scott Tyler is not like other teenagers. With a single thought he can alter reality around him. And he can stop anyone else from doing the same. That's why he's so important to ARES, the secret government agency that regulates other kids like him: Shifters. They've sent him on a mission. To track down the enigmatic Frank Anderson. An ex-Shifter who runs a project for unusual kids - as if the ability to change your every decision wasn't unusual enough. But Anderson and the kids have a dark secret. One that Scott is determined to discover. As his obsession with discovering the truth takes him further away from anyone he cares about, his grip on reality starts to weaken. Scott realises if he can't control his choices, they'll control him.

The country is at war. Beset by enemies within and without. And all because of the decisions changed by one boy, Scott Tyler. In this ravaged alternative world, Scott hardly recognizes himself. He's a war hero, a leader of a unit of Shifters and maybe the only one who can prevent the country's frail defenses from crumbling. But all Scott wants to do is find a way back to the reality he knew, without losing the girl he loves. With every Shift he makes, Scott edges closer towards oblivion. With no one to trust - not even himself - how much is he willing to risk to get home?