Men from Scotland Yard and military intelligence build a dossier on a sabotage ring.
Liam Redmond
as Cmdr. Robert Brennan
André Morell
as Supt. Folland
Kenneth Griffith
as Jimmy Ellis
Anthony Bushell
as Maj. Elliott
Mary Morris
as Anna Braun
Joan Hickson
as Mrs. Ellis
Anthony Nicholls
as Grant Mansfield
Geoffrey Keen
as Morgan Williams
John Bailey
as Stringer
Patric Doonan
as George Ellis
Dora Bryan
as Mrs. Bowers
Stuart Lindsell
as Commissioner
