Based on a the short story "Low Flying Aircraft" by J.G. Ballard and set in a near future where humans are dying breed. Judite and André flee to a semi-abandoned apartment complex to protect their mutant child from certain death.
The location is the town of El Paris. When ten-year-old boy Quasimodo shows signs of deformity, his well-to-do parents place him in the charge of the town’s mysterious evangelist, Frollo. In exchange, they adopt a Cuban girl, Esméralda, from a lower social class. Ten years later, El Paris is menaced by a serial killer, and Quasimodo is the prime suspect.