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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)