The Invisible Killer is a 1939 American mystery film directed by Sam Newfield and starring Grace Bradley, Roland Drew and William Newell.

[1] It was one of the earliest films made by Producers Releasing Corporation, a low-budget outfit concentrating on second features.

A racketeer offers to inform the district attorney about the ringleaders of a gambling syndicate but is murdered before he can do so by a seeming "invisible killer."

Newspaper reporter Sue Walker and her policeman, fiancée Jerry Brown take up the investigation.

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