Kate is a charming young girl who is actually a brutal hitman. She always fulfills the order, eliminating her goals, whoever they may be. But one day the heroine herself becomes a victim. She was poisoned with poison, and she only had a day to live. Keith tries to find the culprit, but there are more questions than answers. In desperation, she kidnaps a teenage daughter by one of her victims. The young girl is imbued with sympathy for the killer and begins to help her in the investigation. The hour of death is inexorably approaching, and the antidote has not been found.