The space colonies represent the final sanctuary of human civilization, peacefully hovering over a once-toxic earth. However, when terrorists launch an attack, the colonists are compelled to abandon their lofty abode and inhabit the contaminated planetary surface. Amidst the pandemonium, a youthful mother becomes estranged from her loved ones and hurtled into an ominous and ambiguous tomorrow. Nevertheless, Sarah refuses to be placated until she locates her offspring.