Dr Brandt Savage's plans for his sabbatical from the University of Chicago change drastically when he is enrolled in a school where he is the sole pupil.
His professor is relentless in her lessons. She's also his captor.
Savage is forced to undertake intense physical and mental training, with no idea why he was chosen or what is expected of him.
But as he learns more about his abductor, Savage discovers just how deeply entwined their lives are. And why, together, they must make a pledge:
Do right by all, and wrong to no one.