John Loder

Reginald Parker / Edward Grey

June Duprez

April Manby Carson

Michael St. Angel

Lieutenant Bob Carson

Miles Mander

Chief Inspector W.R. Allison

Rose Hobart

Dorothy Kent

Gilbert Emery

Dr. Manby

Rex Evans

Leslie Shelton

Matthew Boulton

Inspector Graham

Olaf Hytten

Banks

Lydia Bilbrook

Mrs. Manby

Ian Wolfe

Lord Mayor Herman Brandon R. Clive

Milton Owen

Inspector (Uncredited)