An elderly (human couple) lives in an old Southern mansion, with their only companions being a group of faithful mice. The mice do all the housework for their masters. When the couple dies, the will leaves their entire fortune to the mice. Their closest living relative, a spendthrift nephew, is disinherited. He disputes the will in court, but loses the legal case. He then physically attacks the mice within the court, and is arrested and imprisoned. At night, the nephew escapes from prison. While the mice sleep, he steals their mansion. Mighty Mouse intervenes and retrieves the mansion for the mice.