One flash. One second. One body that no longer belongs to him.

When the worldwide Swap hits, Billy is ripped out of his old life and wakes inside the body of a young woman named Amy Brennan. That would be terrifying enough.

Then he realizes where Amy was when the Swap happened.

Locked inside a psychiatric ward. Restrained. Completely helpless.

While the world outside struggles to understand millions of impossible body exchanges, Billy is trapped in a body overwhelmed by relentless new sensations—and under the control of a doctor who refuses to believe his story.

The longer Billy remains confined, the more the line between the man he remembers being and the woman staring back from the mirror begins to blur. But accepting his new flesh doesn't mean surrendering control of it.

When the truth about what has been happening behind locked doors finally comes out, Billy is given something he hasn't had since the moment of the Swap:

A choice.