Season 1, episode 1.
Original air date: 3 October 1952.
Pam and Jerry are invited to spend the weekend at a famous actrsss` country home, but when they arrive the housekeeper can`t be found and there`s a dead man in the pantry.
Cast: Barbara Britton (Pamela North), Richard Denning (Jerry North), Francis De Sales (Lt. Bill Weigand), Margo Wood (Hannah Wilk), Rita Johnson (Lily Storm), Paul Cavanaugh (Ashley Lockwood), James Kirkwood (Chief Horgan), Sarah Padden (Mrs. Sherwood) and John Warburton (Blair Martin).
From IMDB.

I remember this popular but very tame series. Our world is so hectic and jaded we have a hard time appreciating 1950's television with a code of not being too lurid in the American world of family first and spare the accent on sex and violence.