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
Adele Roberts
Martin Kosleck
Mona Barrie
Marvin Miller
Charles D. Brown
Robert Barrat
Charles Arnt
Egon Brecher
Peggy Converse
Jack Deery
Byron Foulger
Wilton Graff
Ted Hecht
Thomas E. Jackson
Mr. Moto's Last Warning
Think Fast, Mr. Moto
Thank You, Mr. Moto
Mr. Moto's Gamble
Pillow of Death
The Frozen Ghost
Dead Man's Eyes
Mysterious Mr. Moto
The Mark of the Whistler
The Power of the Whistler
Mysterious Intruder
The Secret of the Whistler
Calling Dr. Death
Mr. Moto Takes a Chance
The Thirteenth Hour
The Return of the Whistler
The Whistler
The Shadow
Mr. Moto Takes a Vacation
The Return of Mr. Moto
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