Obsada:

• Basil Rathbone Sherlock Holmes
• Nigel Bruce Dr. John H. Watson
• Evelyn Ankers Kitty
• Henry Daniell Sir Alfred Lloyd
• Thomas Gomez R.F. Meade
• Reginald Denny Sir Evan Barham
• Leyland Hodgson Capt. Roland Shore
• Olaf Hytten Adm. Sir John Prentiss
• Montagu Love Gen. Jerome Lawford
• Rudolph Anders Scheeler, Nazi at church
• Edgar Barrier Voice of Terror
• Robert Barron Gavin, murdered man
• Ted Billings Barman
• Arthur Blake Unidentified Character [AFI catalog name: Crosbie]
• Hillary Brooke Jill Grandis
• Harry Cording Camberwell, dive patron
• Leslie Denison Air Raid Warden Dobson
• Herbert Evans Smithson, butler
• Mary Gordon Mrs. Hudson
• Alec Harford Grimes, dive patron
• Charles Jordan Dugan, dive patron
• Gavin Muir BBC radio announcer
• John Rogers Dive patron
• George Sherwood Unidentified Character [Cabby, per AFI catalog]
• Arthur Stenning Unidentified Officer
• Donald Stuart Unidentified Character [AFI Catalog name: Grady]
• Harry Stubbs Taxi Driver 3016
• John Wilde Unidentified Nazi