First edition cover.

Joseph Curtin and Alice Frost  as Mr. and Mrs. North (1950)

Mr. and Mrs. North was a radio mystery series that aired on NBC and
CBS from 1942 to 1954. The fictional amateur detectives were created
by Frances and Richard Lockridge. They were featured in a series of
26 Mr. and Mrs. North novels, a Broadway play, a motion picture and
several radio and television series.

In 1946, Mr. and Mrs. North received the first Best Radio Drama Edgar
Award from the Mystery Writers of America (in a tie with CBS‘s The
Adventures of Ellery Queen). The Woodbury Soap company was the
programs initial sponsor.