It’s interesting that Carolyn was so ready to discard Burke just based on what Liz told her about Burke even though before and after wards she’s still fascinated by him.
Quoted from Roservations:
Burke comes in and greets them. Speak of the devil, says Maggie. Were you? asks Burke, immaculate in a three piece suit. We were just talking about you, says Carolyn. You couldn't have chosen a more fascinating subject! declares Burke.
I really like that (whatever you’d call it) attitude Burke has.
With the excellent way the suspicion gets moved around in this story I’m surprised Mrs. Johnson didn’t also become a suspect.