In Nina's world, children have GPS trackers until they turn 18, and surveillance satellites monitor for subversive talk. Tight control stands between young women and a threatening sexuality; at 16, teenage girls get tattooed with their age and become fair game. Fifteen-year-old Nina, unlike her friends, dreads becoming “sex-teen.” Her life is too confusing without extra complications: Her mother's just died, and Nina's half sister Dee might be legally claimed by her father to be a servant—or worse. How does the cute boy who might be a member of the resistance fit into Nina's life? And had Nina's mother been part of the resistance herself? Nina doesn't want to get involved, but she needs to protect Dee. A large suspension of disbelief is required for the dysfunctional gender politics. (How did the situation get so broken? How do teenage boys and girls manage to be friends when they're only weeks or months away from effectively legal rape?) Otherwise, a fun little thriller for the abstinence romantics. (Science fiction. 12-14)