Worker Juan Rivero goes to jail, and his wife Elena and daughter Sagrario are helped by Dr. Horacio Rueda, who falls in love with Elena. When Juan is released, the relationship ends, but Sagrario, now a charming young woman, plans to marry Dr. Rueda.
After experimenting on himself and becoming invisible, scientist Jack Griffin, now aggressive due to the drug's effects, seeks a way to reverse the experiment at any cost.
To win the heart of a rather simple minded young man who doesn't seem to care much for women, a young foreign lady takes a job as the chambermaid to the man's sister in law.
Self-made businessman Sir Grant Rayburn is obsessed with making money to the exclusion of all else. He shows little interest in his daughter Jill and is irritated when she falls in love with, and wishes to marry, a young man named Tom.
Medical student Antti Ahonen, who is fighting tuberculosis, finds himself in the middle of a love triangle with his friend Heikki Huhtamäki and his crush Helmi Hirvinen.