Calling Dr. Death was the first film in the "Inner Sanctum Mystery" series. In June 1943, Universal purchased the screen rights to the series from Simon and Schuster, Inc. who were publishers of the popular mystery novels and radio shows. Simon and Schuster were using the title Inner Sanctum for their series of mystery novels they had published starting in the 1930s.
Calling Dr. Death was the first film in the "Inner Sanctum Mystery" series. In June 1943, Universal bought the rights to produce films based on Simon and Schuster's popular mystery novels and radio shows. Simon and Schuster had been publishing a series of mystery novels under the title Inner Sanctum since the 1930s.