A scientist stands against an entire town when he discovers their medicinal spa is polluted.

Dr. Thomas Stockmann learns that a tannery is responsible for polluting a hot spring in his town and feels a moral obligation to inform the community about it. But since several prominent citizens had planned on creating a health spa built around the springs, his brother Peter, the mayor, declares that a clean-up is unnecessary. Tom was one of the backers of the spa, but still thinks that the people need to know the truth. Although the town council tries to silence him, Tom speaks out. But public opinion has been turned against him, resulting in his medical practice being ruined and his marriage strained.