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.
Basil Rathbone
Nigel Bruce
Evelyn Ankers
Reginald Denny
Thomas Gomez
Henry Daniell
Montagu Love
Olaf Hytten
Leyland Hodgson
Mary Gordon
Hillary Brooke
Harry Cording
Herbert Evans
Fred Graham
Gavin Muir
Edgar Barrier
Bobby Hale