Men from Scotland Yard and military intelligence build a dossier on a sabotage ring.
Cmdr. Robert Brennan
Supt. Folland
Jimmy Ellis
Maj. Elliott
Anna Braun
Mrs. Ellis
Grant Mansfield
Morgan Williams
Stringer
George Ellis
Mrs. Bowers
Commissioner
Scotland Yard Man
Percy Ward
Reginald Gordon-Wells
Benson - Scotland Yard man
Slater
Albert Brewer (uncredited)
Mrs Skinner (uncredited)
Pier Superintendant (uncredited)
Street photographer (uncredited)
Mrs Finch-Harvey - Music Club member (uncredited)
Detective (uncredited)
Railway shunter (uncredited)
