Shadows and Fog - Woody Allen

A small and insignificant bookkeeper, Kleinman, is awoken one night by his neighbors who wants his help to track down a strangler who has been killing people all over town. The citizens form vigilance committees, but when Kleinman has dressed, his neighbors have disappeared. Meanwhile a circus has come to town. Irmy and Paul are two of the artists. After a fight, Irmy leaves the circus in the middle of the night. Eventually she meets Kleinman, scared and alone.