In the 7th film of the "Crime Doctor" series based on the radio program, Dr. Robert Ordway is summoned to take attend a diabetic, and gives an injection of insulin taken from a bottle in the patient's pocket. The man dies and Ordway discovers that what he thought was insulin was really poison. Oops! Two other people are murdered before Ordway discovers who replaced the insulin with poison and what the motive was
Warner Baxter
Dr. Robert Ordway
Adele Roberts
Claire Foster (as Adelle Roberts)
Martin Kosleck
Karl Ganss
Mona Barrie
Harriet Travers
Marvin Miller
Casper
Charles D. Brown
Insp. Burns
Robert Barrat
Clyde Travers (as Robert H. Barrat)
Charles Arnt
Attorney Allen S. Tobin (uncredited)
Egon Brecher
Dr. Evans (uncredited)
Peggy Converse
Connie Day (uncredited)
Jack Deery
Party Guest (uncredited)
Byron Foulger
Harris, Makeup Man (uncredited)
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