Guzman, a rich U.S. landowner is forced to leave for a short time, leaving his pregnant wife alone in the ranch. That night, a group of bandits, believing that the house is empty, enters with the purpose of stealing. She surprises them and they kill her. When Guzman returns, he finds in the fingers of his dead wife the tie pin of the murderer. Then, with the help of a Portuguese and a Mexican friends,he begins his revenge.

Dr. Zimmer, a brilliant but eccentric scientist, develops a technique of controlling people through electronic impulses. When he reveals his findings to the scientific community, they declare him a charlatan and ask for his disbarment. Shattered, Dr. Zimmer dies of a heart attack but implores his lovely daughter Irma to carry on his work. She vows to avenge her father, and to that end she sets her eyes on a beautiful exotic dancer, Nadja, with the intention of controlling her will and using her as the instrument of her vengeance...