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
as Dr. Robert Ordway
Adele Roberts
as Claire Foster (as Adelle Roberts)
Martin Kosleck
as Karl Ganss
Mona Barrie
as Harriet Travers
Marvin Miller
as Casper
Charles D. Brown
as Insp. Burns
Robert Barrat
as Clyde Travers (as Robert H. Barrat)
Charles Arnt
as Attorney Allen S. Tobin (uncredited)
Egon Brecher
as Dr. Evans (uncredited)
Peggy Converse
as Connie Day (uncredited)
Jack Deery
as Party Guest (uncredited)
Byron Foulger
as Harris, Makeup Man (uncredited)
