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.
Film directed and scripted by John Dalton at the beginning of his stay in Argentina. Alton decided to make an independent project under the name of Alton Films, and summoned Luis Sandrini to star it.
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.
All 12 jury members who sent an innocent man to the gallows are gathered together for a demonstration of how convictions can be made on circumstantial evidence.