…did you get the reference?
The Doclopedia #2,607
The Doc Tempest Series: Doc Tempest And The Demon On The Radio (1930)
Publication Date: December, 1930
Tale Type: Evil Mastermind spreading terror for monetary gain
Doc, Sally, Alice, Nick, and Simon investigate a mysterious voice that overrides all radio signals to announce imminent death and destruction. Carlos & Frank put in short appearances. Plenty of Los Angeles details and unnamed movie star cameos in this mostly detective story. A couple of the murders are pretty clever, and the big chase at the end is thrilling.