The hero, a janitor played by Chaplin, is fired from work for accidentally knocking his bucket of water out the window and onto his boss the chief banker (Tandy). Meanwhile, one of the junior managers (Dillon) is being threatened with exposure by his bookie for gambling debts unpaid. Thus the manager decides to steal from the company.
A man recognizes the thief who had previously robbed him as one of the men involved in an unrelated mob shootout.
During the Civil War a young soldier loses his nerve in battle and runs away to his home to hide; his sister puts on his uniform, takes her brother's place in the battle, and is killed. Their mother, not wanting the shameful truth to become known, closes all the shutters (hence the film's title) and keeps her son's presence a secret for many years, though two boyhood chums stumble upon the truth...
