A rash of bizarre murders in New York City seems to point to a group of grotesquely deformed vagrants living in the sewers. A courageous policeman, a photo journalist and his girlfriend, and a nutty bum, who seems to know a lot about the creatures, band together to try and determine what the creatures are and how to stop them.

A bored wife, who is planning to run away from her minister husband, is taken hostage in a bank robbery. However, she sees the thrill in being involved in the chase and becomes an accomplice to helping the younger robber escape his pursuers. As things progress, she learns he pulled the robbery to get enough money to help his pregnant girlfriend leave a home for unwed mothers. The two have a brief flirtation, but it is clear the housewife just needs something to enliven her life.