by Elwyn Jones.
[Starring] Stratford Johns as Det. Chief Supt. Barlow, Frank Windsor as Det. Chief Insp. Watt, Philip Brack as Det.-Insp. Jim Cook, Norman Bowler as Det.-Sgt. Hawkins, Peggy Sinclair as Policewoman Det.-Sgt. Allin, Dan Meaden as Det.-Con. Box, Gavin Campbell as Det.-Con. Digby
with John Barron as A.C.C. Gilbert