Three Teens from Three Centuries. One Frozen World. And a Mystery That Could Shatter Galactic Peace.In the 24th century, Earth's fragile alliances hang in the balance. On the alien planet New Horizon, a pioneering research team goes silent amid a sudden, brutal winter—and rumors of sabotage by unknown intelligences. With advanced tech faltering and tensions rising, Earth's last hope lies in the past.Operation Hourglass recruits teens with the one thing mode...