A mysterious object falls from the sky and smashes through the window of a rundown apartment building. From this object emerges a strange little spider? The creature is discovered by Charlotte, a rebellious 12-year-old girl obsessed with comic books. Keeping it as a secret pet, she names it Sting. As Charlotte's fascination with Sting increases, so does its size. Growing at a monstrous rate, Sting's appetite for blood becomes insatiable.