The Marriage Circle (1924)

Professor Stock and his wife Mizzi are always bickering. Mizzi tries to seduce Dr. Franz Braun, the new husband of her good friend Charlotte. Dr. Braun's colleague, Dr. Mueller, who has had his eye on Charlotte, sees this as his opportunity, although the Brauns are very happily married. Through a misunderstanding, Charlotte thinks that her husband is interested in Miss Hofer and asks Mizzi to keep him occupied. Meanwhile, Professor Stock becomes suspicious of his wife and, hoping to obtain a divorce, hires a detective to spy on her.