Mr Pignati, nicknamed The Pigman, is a lonely old man desperate for company.
When two teenagers, John and Lorraine, telephone him pretending they're collecting money for charity, they have no idea what they're letting themselves in for. Soon the Pigman is showering them with special treats, gifts and money.
The fun and excitement John and Lorraine share with him is a welcome break from the boredom and pressures of their parents and everyday life. Before long they are torn between feeling sorry for the Pigman and accepting everything he offers them.
But finally they take advantage of him once too often - with terrifying consequences.