Today’s Mystery: Johnny continues his investigation in Nicaragua into the disappearance of a man and a boat insured for a combined $400,000. Original Radio Broadcast Dates: August 1, 2, and 3, 1956 Originating from Hollywood Starring: Bob Bailey as Johnny Dollar; Harry Bartell; Lawrence Dobkin; Virginia Gregg; Parley Baer; Don Diamond; Russell Thorson When making…