Great suspense-drama with some murder thrown in. Herbert Lom (familiar to most as Chief Insp. Charles Dreyfus in the "Pink Panther" movies), is brilliant here in his dual role as twin brothers Jules and Georges de Lisle, trapeze artists. Phyllis Dixey (Penny aka Gloria Gregg) and Terence de Marney (Mike Bergen) are equally good as the conniving couple who wreak havoc on the lives of the de Lisles. Recommended viewing.