Ben Lyon (Bernard Froy), Syd Walker (Det. Insp. Davidson), Terence de Marney (Det. Sgt. Raines), Barbara Blair (Renée la Lune), Athole Stewart (Lord Sorrington), Antoinette Cellier (Louise Rogers), Leslie Perrins (Count Mattoni), David Burns (Diamond), Ronald Shiner (Mullet), Aubrey Mallalieu (Johnson), Kathleen Harrison (Polly), and Gus McNaughton (Martin).