A bigamist named Derek Evers marries and uses his first wife Linda and second wife Pauline in order to get access to plans of a revolutionary technology that both of their companies are developing. When Pauline finds out what he's doing, and starts to call the police. he murders her. Barnaby Jones is hired to find Pauline, and he discovers Derek's secret life. Barnaby Jones pursues Derek in order to stop him from murdering another innocent person and escaping, with the revolutionary technology plans..
—charmardee-smith