by Elwyn Jones.
[Starring] Stratford Johns as Det. Chief Supt. Barlow, Frank Windsor as Det. Chief Insp. Watt, Norman Bowler as Det.-Sgt. Hawkins, Peggy Sinclair as P/W Det.-Sgt. Allin, Gilbert Wynne as Det.-Con. Dwyer, Dan Meaden as Det.-Con. Box, David Quilter as P.C. Tanner
with John Barron as Asst. Chief Con. Gilbert