Although Lou McTavish has been reared strictly by her father, Captain McTavish, when she hears that he has been killed in a fight, she allows herself to accept the friendship of a music hall singer named Rose. The two women visit a club called the Straw Cellar, where Lou attracts the attention of Jim Douglass, who plans to inflict revenge on Andrew Solman, a male vampire who once insulted his sister, by encouraging him to marry a dissolute woman. Jim takes Lou to the country and for five months trains her to act "like a lady," after which he introduces her to Andrew. The latter soon proposes to Lou but she turns him down, and later, when she explains Jim's scheme to him, he assaults her. At that moment, Captain McTavish, who has spent months searching for his daughter, sees and tries to save her, but as he is losing the fight, Jim rushes in and shoots Andrew. Finally aware of Lou's true nature, Jim confesses that he loves her.