Coarse country girl Sis Hopkins and general store clerk Ridy Scarboro are so engrossed in their dalliance that a basket is overturned and a large can of oil spills into a pool, creating a slow leak. Wealthy villager Vibert thus becomes convinced that Sis's farm is located on a pocket of oil, and he schemes to gain control of the property by marrying Sis. Vibert sends her to a young woman's seminary for refinement. Sis creates chaos in the school and is a problem for principal Miss Peckover. Vibert eventually realizes Sis will never measure up to his standards for a wife. Ridy, who has been jealous, is overjoyed when Sis returns home. Vibert entices Pa Hopkins into selling the property for a small amount, but Sis shrewdly succeeds in tripling the price. Finally Vibert discovers the can in which he has invested so heavily.