A company's stockholders hold their meeting at a lonely mansion. A mad doctor conducting experiments in the mansion starts to strangle them one at a time with a nylon noose. The survivors must figure out a way to stop him.

The Shadows Grow Longer (German: Die Schatten werden länger) is a 1961 Swiss drama film directed by Ladislao Vajda. The film was selected as the Swiss entry for the Best Foreign Language Film at the 34th Academy Awards, but was not nominated.