Wee Lady Betty rules the O'Reilly castle with a stern hand and a big heart until she learns that Roger, the O'Reilly heir, is coming to take possession of his estate. Unable to provide for her aged father, Betty conceives of a scheme. Feigning to leave the castle, she returns after dark with her father and installs him in the haunted chamber. The next day when Roger arrives with his mother, he is met by villagers angry at Betty's banishment. In the guise of a maid, Betty shows the O'Reillys through the castle, laying special emphasis on the haunted chamber. That night, while bringing food to her father, Betty hears Roger opening the chamber door. Attempting to frighten him away, she jumps behind a suit of armor, but he shoots at the "ghost." Meanwhile the villagers storm the castle and Roger goes to appease them. Betty saves Roger by commanding them to leave, and her future at the castle seems secure when she and Roger embrace.