خلاصه داستان :

14-year old Susan Shawson travels back in time in her building's elevator. As altered by a retired physicist living in her building, it transports her from Philadelphia of 1998 back to the same place in 1881. There she meets Victoria Walker, a girl her own age in need of assistance with her own family problems. Gradually discovering the power of her time machine, Susan, Victoria, and her young brother Robert travel back and forth in time and succeed in changing both the past and the future.

خلاصه داستان : سیریوس ۶ب، سال ۲۰۷۸. در سیاره‌ای معدنی و دوردست که توسط یک دهه جنگ ویران شده است، دانشمندان سلاحی بی‌نقص ساخته‌اند: نژادی از دستگاه‌های کشتار خودتکثیرشونده و تیغه‌دار که به نام فریادزن‌ها شناخته می‌شوند و فقط برای یک هدف طراحی شده‌اند – شکار و نابودی تمام اشکال حیات دشمن.

SIRIUS 6B, Year 2078. On a distant mining planet ravaged by a decade of war, scientists have created the perfect weapon: a blade-wielding, self-replicating race of killing devices known as Screamers designed for one purpose only -- to hunt down and destroy all enemy life forms.