Returning to civilian life, Wonder Woman, posing as mortal Diana Prince, notices suspicious activity at The Daily Gazette. All the women in the office seem to be fawning over the newcomer, reporter Dale Tinhorn. When she decides to confront him, she grows even more suspicious.
Feeling jealous, Steve Trevor, U.S. Army Air Forces intelligence officer and Diana's boyfriend, goes down to the Gazette after hours to confront him. Tinhorn takes this opportunity to reveal himself to be the occultist Dr. Psycho. After this confrontation, Steve goes missing. As Wonder Woman, Diana sets out to find Steve and put a stop to Dr. Psycho's dastardly behavior.