England, at the start of World War Two. Mysterious wireless broadcasts, apparently from Nazi Germany are heard over the BBC. They warn of acts of terror in England, just before they take place. Baffled, the Defense Committee call in Sherlock Holmes.

• Universal Pictures
• Basil Rathbone
• Nigel Bruce
• Evelyn Ankers
• Reginald Denny
• Thomas Gomez
• Henry Daniell
• Montagu Love
• Olaf Hytten