A mysterious criminal known as The Whispering Shadow commits crimes by means of a gang he controls by television and radio rays. Jack Norton, whose brother was murdered by The Whispering Shadow, suspects that the eerie Professor Strang – whose ghostly wax museum contains figures far too lifelike – may be involved in the crimes.
Crime | Horror | Adventure | Mystery
| Bela Lugosi | … | Professor Anton Strang | |
| Viva Tattersall | … | Vera Strang | |
| Malcolm McGregor | … | Jack Foster (as Malcolm MacGregor) | |
| George J. Lewis | … | Bud Foster | |
| Henry B. Walthall | … | J.D. Bradley (company president) | |
| Robert Warwick | … | Detective Robert Raymond | |
| Roy D’Arcy | … | Professor Alexis Steinbeck |
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Chapter 1 – Master Magician
Chapter 2 – The Collapsing Room
Chapter 3 – The All-seeing Eye
Chapter 4 – The Shadow Strikes
Chapter 5 – Wanted for Murder
Chapter 6 – The Man Who Was Czar
Chapter 7 – The Double Room
Chapter 8 – The Red Circle
Chapter 9 – The Fatal Secret
Chapter 10 – The Death Warrant
Chapter 11 – The Trap
Chapter 12 – King of the World