A scene from “Unfinished Business”

Elliot Robinson: [after Jessica exposes the murderer] I found the dynamite, and when I confronted Doris with it, she told me everything. She has this hate for Carol. Sick. Psychotic. She loved Brian, and then when Carol took him away, something snapped. She put that bomb in Carol's car, and then when Brian was killed in her place...

Sgt. Len Berger: Go on, Mr. Robinson.

Elliot Robinson: The next day, she went back to the house to find Carol, to finish the job. She took a knife from the kitchen and started up the stairs when she heard the front door start to open. She ducked into the closet and waited. Through the crack, she recognized Lieutenant Travis. She knew that if Travis found her there, he'd put everything together, so she stabbed him and ran out.

Jessica Fletcher: And when Carol came home, she caught a glimpse of Doris. A trick of light or her emotions made her think that it was Barbara.

Elliot Robinson: My only hope was to make you think Carol was crazy. I had no idea Barbara was really alive.

Jessica Fletcher: Where is Doris now?

Elliot Robinson: Home. I have a nurse with her. She's sedated. I know I should have told you, but I couldn't. You see, she's all I had left.