Mr. & Mrs. North ran on radio for 12 years (1942-54), the last two concurrent with their television run. After Richard Lockridge's novels had been adapted for Broadway and the big screen, Jerry & Pam North transitioned to radio, with Joseph Curtin & Alice Frost in the title roles.
In "Who Killed Mr. Stefano?", the Norths are pulled into a tangled web that goes from a domestic dispute to murder.
On radio, the series was not too different from other mysteries of the period. Nothing special, which might explain why the TV series only lasted two years.