A gloom future awaits the human race, a future where they’ll have to face extermination. But this apocalyptic event can be avoided by intervening in the past. One chronoagent and one only, a young woman who’s been born and raised only to this purpose, is entrusted with the mission to save the humankind from its doomed fate. She will have to unceasingly go up and down in the space-time, to track the unwitting carriers of the alien parasite she has to eliminate, to avoid the end of the human race. And she’ll have to undergo a complete change: leaving aside compassion and moral scruples, she’ll become Lilith, the killer.