Heidi Cruise, age 17, has a single chance at freedom, but it involves breaking the law and completing Savage Run: a gruelling, male-only obstacle course program.
Nicholas Volkov has one goal: to make sure when he becomes president over the hierarchical society of Newland that he doesn't follow in his tyrannical father's footsteps.
After Heidi registers for the program, Nicholas discovers that she's a girl. Being a rebel in his own right, Nicholas doesn't turn her in, but decides to help in any way possible.
Heidi struggles through the obstacle courses in Savage Run. Physically and emotionally drained, it is only during downtime between events that she's able to make sense of her world and get a little closer to the secretive Nicholas.
But with the threat of death constantly barreling down on her, and with menacing contestants looming around every obstacle, she realizes the chances of her getting killed are far greater than her chances of surviving and attaining her freedom.