A purple moon was just the beginning. . . Dust from a passing comet turns the moon purple, but also carries a lethal pathogen that attacks the hormones produced during puberty. Within hours, older teens and adults are dead. Thirteen-year-old Abby Leigh must help her brother Jordan and baby sister Toucan survive in the terrifying new world. Battling against hunger and violent gangs, Abby is helpless against the biggest threat of all, the time bomb that is her adolescence.