Special Agent Dick Barton is on the trail of a group of crimminals hiding as a fairground troupe that want to take over the world by killing people with ultrasound. THis has fast moving action and locations including Blackpool Tower. This is one of 3 Dick Barton films made by Hammer in the late 1940's. Don Stannard was killed in a car accident after filming the third film.
2/5 
Jean Lodge