This is the voice of terror

Sherlock Holmes and the Voice of Terror is the third film in the Basil Rathbone/Nigel Bruce series of Sherlock Holmes movies. Made in 1942, the movie combines elements of the Sir Arthur Conan Doyle story "His Last Bow" and loosely parallels the real-life activities of Lord Haw-haw. Horror film "scream queen" Evelyn Ankers appears as leading lady.
The film begins with a title card describing Holmes and Watson as "ageless", as an explanation as to why the film is set in contemporary times, rather than Holmes' era of 1881-1914, as the preceding 20th Century Fox films were. Though there is a nod to the classic Holmes in a scene where Holmes and Watson are leaving 221b Baker Street, and Holmes picks up his Deerstalker.


Watson protests, and Holmes reluctantly puts on a fedora instead.
Holmes is called into the "Inner Council" of British Intelligence by Sir Evan Barham (Reginald Denny), to assist in stopping Nazi saboteurs operating in Britain, whose activities are announced in advance in radio broadcasts by "The Voice of Terror".
Gavin (Robert Barron), one of Holmes's operatives, is killed with a German dagger in his back.

Before he dies, Gavin utters the word "Christopher." Later, Holmes and Watson go to the Limehouse district of London, where they meet with Gavin's wife Kitty (Evelyn Ankers).
Holmes tells the council that, through the use of an oscilloscope to carefully analyze and compare sound wave patterns from radio broadcasts of live vs. pre-recorded voices, he has determined that "The Voice of Terror" is actually recorded on phonograph records in England, but broadcast from Germany. Using a tip from Kitty, Holmes and Watson go to the old Christopher Docks, where they are followed by Sir Anthony Lloyd (Henry Daniell) of the council. The three men are captured by a group of Nazi spies led by a man named Meade (Thomas Gomez), although Meade manages to escape through a trap door to a waiting speedboat.  more