The Scarlet Clue is a 1945 American mystery film directed by Phil Rosen and starring Sidney Toler, Mantan Moreland and Ben Carter.

The science lab where the radar secrets are developed shares the same skyscraper floor with a radio soap opera studio, the program apparently under the thumb of its tyrannical sponsor, Mrs. Marsh.

Blackmailing actress Gloria Bayne and genial ham actor Willie Rand meet death by this device.

When the Leader judges Brett to be a liability, he is lured to a freight elevator with a trap-door floor that drops him seven stories to his death.

During an in-and-out corridor chase on the 7th floor, the Leader is revealed to be Mrs. Marsh...who dies when she panics and accidentally steps into her own elevator trap.