根据真实案件改编，1968年至1985年间，活跃在佛罗伦萨的连环杀手杀害了14名受害者，受害者通常是在郊外发生亲密关系的年轻情侣，该案至今未破。17 年的恐怖，震惊了整整一代人。

　　In 2050, Earth has become a dry and desolate place. Fighter pilot Nova is forced to travel back in time to prevent a devastating environmental disaster, however an unforeseen side-effect of time travel makes Nova young again and she crash lands into 2025 as a twelve-year old. Nobody seems to take her and her mission seriously, except for Nas - a neglected teen who tries to keep this mysterious girl and her little flying robot ADD out of the hands of the secret service. Will Nova and Nas succeed in saving the future world?